Merge pull request 'ci: make release step idempotent + fix Gitea asset upload' (#9) from feature/gitea-release-workflow into master

Reviewed-on: http://192.168.1.74:30008/kfj001/goon_plugin/pulls/9
Reviewed-by: robot <robot@westerntechnologies.duckdns.org>

.claude/settings.local.json

@@ -1,8 +0,0 @@
-{
-  "permissions": {
-    "allow": [
-      "Bash(npm run *)",
-      "Bash(node --check /home/kyle/Documents/goon_plugin/src/viewer/index.js)"
-    ]
-  }
-}

.devcontainer/devcontainer.json

@@ -1,5 +1,5 @@
 {
-  "name": "Goon Plugin Dev",
+  "name": "VidPlex Dev",
   "image": "mcr.microsoft.com/devcontainers/javascript-node:22",
   "features": {
     "ghcr.io/devcontainers/features/sshd:1": {}

.github/workflows/ci.yml

@@ -19,6 +19,8 @@ jobs:
 
       - name: Install dependencies
         run: npm ci
+      - name: Build Articacts
+        run: npm run build
 
       - name: Run tests
         run: npm test

.github/workflows/release.yml

@@ -0,0 +1,81 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: 22
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Build
+        run: npm run build
+
+      - name: Package dist.zip
+        shell: bash
+        run: |
+          cd dist
+          zip -r "../vidplex-${{ github.ref_name }}.zip" .
+
+      - name: Create Gitea release
+        shell: bash
+        env:
+          GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}
+          GITEA_API: ${{ secrets.GITEA_API || 'http://192.168.1.74:30008/api/v1' }}
+          REPO: ${{ github.repository }}
+          TAG: ${{ github.ref_name }}
+        run: |
+          if [ -z "$GITEA_TOKEN" ]; then
+            echo "::warning::GITEA_TOKEN secret is not set; skipping release creation. Add it in Gitea repo Settings > Secrets (repo scope)."
+            exit 0
+          fi
+
+          json_id() { node -e 'let d="";process.stdin.on("data",c=>d+=c).on("end",()=>{const j=JSON.parse(d||"{}");if(j.id==null){console.error("no release id:",JSON.stringify(j));process.exit(1)}console.log(j.id)})'; }
+
+          release_id=$(
+            curl -s -o /tmp/rel.json -w "%{http_code}" \
+              -H "Authorization: token $GITEA_TOKEN" \
+              "$GITEA_API/repos/$REPO/releases/tags/$TAG"
+          )
+
+          if [ "$release_id" = "200" ]; then
+            echo "Release for $TAG already exists; reusing it."
+            release_id=$(json_id < /tmp/rel.json)
+          else
+            echo "Creating release for $TAG."
+            release_id=$(
+              curl -s -o /tmp/rel.json -w "%{http_code}" -X POST \
+                -H "Authorization: token $GITEA_TOKEN" \
+                -H "Content-Type: application/json" \
+                -d "{\"tag_name\": \"$TAG\", \"name\": \"$TAG\", \"body\": \"Automated release build for $TAG\"}" \
+                "$GITEA_API/repos/$REPO/releases"
+            )
+            case "$release_id" in
+              201|200) release_id=$(json_id < /tmp/rel.json) ;;
+              *) echo "::error::release create returned HTTP $release_id: $(cat /tmp/rel.json)"; exit 1 ;;
+            esac
+          fi
+
+          echo "Uploading asset to release $release_id."
+          resp=$(curl -s -o /tmp/att.json -w "%{http_code}" -X POST \
+             -H "Authorization: token $GITEA_TOKEN" \
+             -F "attachment=@vidplex-${TAG}.zip" \
+             "$GITEA_API/repos/$REPO/releases/$release_id/assets")
+          if [ "$resp" != "200" ] && [ "$resp" != "201" ]; then
+            echo "::error::asset upload returned HTTP $resp: $(cat /tmp/att.json)"
+            exit 1
+          fi
+          cat /tmp/att.json
+          echo

.gitignore

@@ -3,3 +3,4 @@ dist/
 .vscode-insiders/
 /icons
 /icons/*
+.claude/settings.local.json

README.md

@@ -1,4 +1,4 @@
-# Goon Plugin
+# VidPlex
 
 A Chrome extension (Manifest V3) that finds videos on the current page and displays them in a 2x2 grid.
 
@@ -55,4 +55,4 @@ src/
 
 ## VS Code workspace
 
-Open `goon_plugin.code-workspace` to get the project with recommended extensions pre-installed.
+Open `vidplex.code-workspace` to get the project with recommended extensions pre-installed.

__tests__/config_validation.test.mjs

@@ -0,0 +1,102 @@
+/**
+ * config_validation.test.mjs — Validate build configuration integrity.
+ *
+ * Prevents regressions like the phantom entry module issue that kfj001
+ * hit: vite.config.ts referenced probeFn.js and scrapeFn.js but those
+ * files were never created.
+ */
+import { describe, it } from './runner.mjs';
+import { readFileSync, existsSync } from 'fs';
+import { resolve, dirname } from 'path';
+import { fileURLToPath } from 'url';
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const root = resolve(__dirname, '..');
+
+describe('Config: build integrity', () => {
+  it('vite.config.ts entry modules must exist as source files', () => {
+    const viteConfig = readFileSync(resolve(root, 'vite.config.ts'), 'utf8');
+
+    const matches = viteConfig.matchAll(/resolve\(__dirname,\s*'([^']+)'\)/g);
+    const inputEntries = [...matches]
+      .map(m => m[1])
+      .filter(p => p.startsWith('src/'));
+
+    const missing = inputEntries.filter(p => !existsSync(resolve(root, p)));
+
+    if (missing.length > 0) {
+      throw new Error(
+        `vite.config.ts references ${missing.length} missing file(s): ${missing.join(', ')}`
+      );
+    }
+    if (inputEntries.length === 0) {
+      throw new Error('No entry points found in vite.config.ts');
+    }
+  });
+
+  it('content.js must NOT use inline script injection (textContent)', () => {
+    const contentJs = readFileSync(resolve(root, 'src/content/content.js'), 'utf8');
+
+    // Strip comments before checking for textContent usage
+    const codeOnly = contentJs
+      .replace(/\/\*[\s\S]*?\*\//g, '')  // block comments
+      .replace(/\/\/.*$/gm, '');         // line comments
+
+    if (codeOnly.includes('textContent')) {
+      throw new Error(
+          'content.js uses inline script injection (textContent). ' +
+          'Some sites block inline scripts via CSP. Use script.src instead.'
+      );
+    }
+    if (!codeOnly.includes('script.src') || !codeOnly.includes('chrome.runtime.getURL')) {
+      throw new Error(
+        'content.js does not use CSP-safe script.src = chrome.runtime.getURL(...)'
+      );
+    }
+  });
+
+  it('interceptors.js must be a standalone file', () => {
+    const path = resolve(root, 'src/inject/interceptors.js');
+    if (!existsSync(path)) {
+      throw new Error('src/inject/interceptors.js does not exist');
+    }
+    const content = readFileSync(path, 'utf8');
+    if (!content.includes('(function ()') || !content.includes('})();')) {
+      throw new Error('interceptors.js should be a self-contained IIFE');
+    }
+  });
+
+  it('manifest.json content_scripts must reference content.js', () => {
+    const manifest = JSON.parse(
+      readFileSync(resolve(root, 'manifest.json'), 'utf8')
+    );
+    const cs = manifest.content_scripts;
+    if (!cs || !Array.isArray(cs)) {
+      throw new Error('manifest.json has no content_scripts');
+    }
+    const hasContentScript = cs.some(s => s.js && s.js.includes('content.js'));
+    if (!hasContentScript) {
+      throw new Error('No content_scripts entry references content.js');
+    }
+  });
+
+  it('manifest.json must declare interceptors.js in web_accessible_resources', () => {
+    const manifest = JSON.parse(
+      readFileSync(resolve(root, 'manifest.json'), 'utf8')
+    );
+    const war = manifest.web_accessible_resources;
+    if (!war || !Array.isArray(war)) {
+      throw new Error(
+        'manifest.json has no web_accessible_resources. ' +
+        'interceptors.js needs this for chrome.runtime.getURL() to work.'
+      );
+    }
+    const allResources = war.flatMap(entry => entry.resources || []);
+    if (!allResources.includes('interceptors.js')) {
+      throw new Error(
+        'manifest.json web_accessible_resources must include interceptors.js. ' +
+        'Without it, the browser blocks chrome.runtime.getURL("interceptors.js").'
+      );
+    }
+  });
+});

__tests__/data_flow.test.mjs

@@ -1,7 +1,10 @@
 import { describe, it } from './runner.mjs';
 import Ajv from 'ajv';
 import addFormats from 'ajv-formats';
-import schema from '../src/viewer/schema.json' with { type: 'json' };
+import { readFileSync } from 'node:fs';
+import { fileURLToPath } from 'node:url';
+import { dirname, join } from 'node:path';
+const schema = JSON.parse(readFileSync(join(dirname(fileURLToPath(import.meta.url)), '../src/viewer/schema.json'), 'utf8'));
 
 const ajv = new Ajv({ strict: false });
 addFormats(ajv);
@@ -182,4 +185,35 @@ describe('Data flow: popup -> storage -> viewer', () => {
       throw new Error('Entry with invalid mediaType should be rejected');
     }
   });
+
+  it('an HLS entry carrying a scan-time referer passes schema + round-trips', () => {
+     // The referer is bound to the entry at scan time so it survives the
+     // watch-later flow (the source tab may be long closed). Because the schema
+     // sets additionalProperties:false, a `referer` the store carries must be an
+     // explicit property or storage-layer validation would reject the entry.
+    const scrapedEntry = {
+      url: 'https://pageA.example.com/watch',
+      src: 'https://cdn.example.com/hls/live/master.m3u8',
+      hlsManifest: 'https://cdn.example.com/hls/live/master.m3u8',
+      mediaType: 'hls',
+      poster: 'https://pageA.example.com/thumb.jpg',
+      tab: 'Referer-protected stream',
+      referer: 'https://pageA.example.com/watch',
+    };
+
+    const valid = validate(scrapedEntry);
+    if (!valid) {
+      throw new Error(`Entry with referer fails schema: ${JSON.stringify(validate.errors)}`);
+    }
+
+     // The referer must survive the storage round-trip intact so the viewer can
+    // send it to the proxy when the user opens a previously-scanned entry.
+    const roundTripped = JSON.parse(JSON.stringify(scrapedEntry));
+    if (roundTripped.referer !== 'https://pageA.example.com/watch') {
+      throw new Error('referer lost during round-trip');
+    }
+    if (!validate(roundTripped)) {
+      throw new Error('Round-tripped entry with referer fails schema');
+    }
+  });
 });

__tests__/hls_detection.test.mjs

@@ -0,0 +1,932 @@
+// HLS.js detection and tracking verification tests
+// Covers scenarios specific to sites that use hls.js for video playback:
+// - Dynamic/late HLS.js loading (polling + MutationObserver)
+// - Content script message collection
+// - Video playback state machine transitions
+// - HLS.js error recovery
+// - Manifest URL edge cases (query strings, protocol-relative)
+// - End-to-end interceptor -> content script -> deep probe pipeline
+import { describe, it } from './runner.mjs';
+import { JSDOM } from 'jsdom';
+import * as fs from 'fs';
+import * as path from 'path';
+import { fileURLToPath } from 'url';
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const viewerSource = fs.readFileSync(
+  path.join(__dirname, '../src/viewer/viewer.js'),
+  'utf-8'
+);
+const interceptorSource = fs.readFileSync(
+  path.join(__dirname, '../src/inject/interceptors.js'),
+  'utf-8'
+);
+const contentSource = fs.readFileSync(
+  path.join(__dirname, '../src/content/content.js'),
+  'utf-8'
+);
+const indexSource = fs.readFileSync(
+  path.join(__dirname, '../src/viewer/index.js'),
+  'utf-8'
+);
+
+/* ========================================================================== */
+/* Helpers                                                                    */
+/* ========================================================================== */
+
+function createBrowserEnv({ storageData = {}, url = 'https://example.com/viewer/viewer.html', hlsMode = 'mocked' } = {}) {
+  const html = `<!DOCTYPE html><html><body><div id="panels"></div></body></html>`;
+  const dom = new JSDOM(html, {
+    url,
+    runScripts: 'dangerously',
+    resources: 'usable',
+  });
+  const win = dom.window;
+
+  const storage = { ...storageData };
+  win.chrome = {
+    storage: {
+      local: {
+        get: (keys) => new Promise((resolve) => {
+          const result = {};
+          for (const key of (keys || [])) result[key] = storage[key];
+          resolve(result);
+        }),
+        set: (data) => new Promise((resolve) => {
+          for (const [k, v] of Object.entries(data)) storage[k] = v;
+          resolve();
+        }),
+        remove: (keys) => new Promise((resolve) => {
+          for (const key of (keys || [])) delete storage[key];
+          resolve();
+        }),
+      },
+    },
+  };
+
+  const hlsCalls = { instances: [], loaded: false };
+  if (hlsMode === 'mocked') {
+    win.Hls = class MockHLS {
+      constructor(opts) {
+        this.levels = [];
+        hlsCalls.instances.push({
+          opts, destroyed: false, events: {}, source: null, media: null,
+          levels: [],
+        });
+      }
+      static get Events() {
+        return {
+          MANIFEST_PARSED: 'manifestParsed',
+          MANIFEST_LOADED: 'manifestLoaded',
+          FRAG_LOADING: 'fragLoading',
+          FRAG_LOADED: 'fragLoaded',
+          FRAG_BUFFERED: 'fragBuffered',
+          BUFFER_APPENDED: 'bufferAppended',
+          BUFFER_FLUSHED: 'bufferFlushed',
+          BUFFER_RESET: 'bufferReset',
+          LEVEL_SWITCHED: 'levelSwitched',
+          LEVEL_UPDATED: 'levelUpdated',
+          FPS_DROP: 'fpsDrop',
+          FPS_MAX_LEVEL_DROP: 'fpsMaxLevelDrop',
+          MEDIA_ATTACHED: 'mediaAttached',
+          MEDIA_DETACHED: 'mediaDetached',
+          ERROR: 'error',
+          DESTROYING: 'destroying',
+        };
+      }
+      static get ErrorTypes() {
+        return { NETWORK_ERROR: 'networkError', MEDIA_ERROR: 'mediaError' };
+      }
+      static isSupported() { return true; }
+      loadSource(src) {
+        const inst = hlsCalls.instances[hlsCalls.instances.length - 1];
+        inst.source = src;
+      }
+      attachMedia(media) {
+        const inst = hlsCalls.instances[hlsCalls.instances.length - 1];
+        inst.media = media;
+      }
+      on(event, handler) {
+        const inst = hlsCalls.instances[hlsCalls.instances.length - 1];
+        if (!inst.events[event]) inst.events[event] = [];
+        inst.events[event].push(handler);
+      }
+      destroy() {
+        const inst = hlsCalls.instances[hlsCalls.instances.length - 1];
+        inst.destroyed = true;
+      }
+      startLoad() {}
+      recoverMediaError() {}
+    };
+    hlsCalls.loaded = true;
+  }
+
+  const consoleLogs = [];
+  win.console = {
+    log: (...args) => consoleLogs.push(args.map(String).join(' ')),
+    error: (...args) => consoleLogs.push('ERROR: ' + args.map(String).join(' ')),
+    warn: (...args) => consoleLogs.push('WARN: ' + args.map(String).join(' ')),
+  };
+
+  return { dom, win, storage, consoleLogs, hlsCalls };
+}
+
+/* ========================================================================== */
+/* Test: Dynamic/late HLS.js loading (polling + MutationObserver)            */
+/* ========================================================================== */
+
+describe('HLS.js: Dynamic late loading detection', () => {
+  it('should patch Hls prototype via polling when Hls appears after interceptors load', () => {
+    const dom = new JSDOM('<!DOCTYPE html><html><body></body></html>', {
+      url: 'https://example.com/watch',
+      runScripts: 'dangerously',
+    });
+    const win = dom.window;
+
+    const intercepted = [];
+    win.postMessage = (msg) => {
+      if (msg.type === 'GOON_PLUGIN_HLS_INTERCEPT') intercepted.push(msg);
+    };
+    win.fetch = () => {};
+
+    // Load interceptors BEFORE Hls is defined
+    win.eval(interceptorSource);
+
+    // Simulate hls.js loading dynamically AFTER interceptors
+    win.Hls = class {
+      loadSource(url) { this._url = url; }
+      attachMedia(media) {}
+    };
+    Object.defineProperty(win.Hls.prototype, 'url', {
+      get() { return this._url || ''; }
+    });
+
+    // Wait for polling to detect and patch Hls (polls every 50ms)
+    return new Promise((resolve, reject) => {
+      setTimeout(() => {
+        try {
+          const hls = new win.Hls();
+          hls.loadSource('https://cdn.example.com/late.m3u8');
+
+          const hlsIntercepts = intercepted.filter(m => m.source === 'hls_loadSource');
+          if (hlsIntercepts.length === 0) {
+            throw new Error('Late-loaded HLS was not intercepted via polling. Sources: ' + intercepted.map(m => m.source).join(', '));
+          }
+          resolve();
+        } catch (e) { reject(e); }
+      }, 200);
+    });
+  });
+
+  it('should detect HLS.js loaded via <script> tag injection (MutationObserver)', () => {
+    const dom = new JSDOM('<!DOCTYPE html><html><body></body></html>', {
+      url: 'https://example.com/watch',
+      runScripts: 'dangerously',
+    });
+    const win = dom.window;
+
+    const intercepted = [];
+    win.postMessage = (msg) => {
+      if (msg.type === 'GOON_PLUGIN_HLS_INTERCEPT') intercepted.push(msg);
+    };
+    win.fetch = () => {};
+
+    // Load interceptors before Hls exists
+    win.eval(interceptorSource);
+
+    if (win.eval('typeof Hls') !== 'undefined') {
+      throw new Error('Hls should not be defined before script tag injection');
+    }
+
+    // Simulate the page adding a <script> tag for hls.js
+    const scriptEl = win.document.createElement('script');
+    scriptEl.src = 'https://cdn.example.com/hls.min.js';
+    win.document.head.appendChild(scriptEl);
+
+    // After the MutationObserver fires, define Hls (simulating script load)
+    win.Hls = class {
+      loadSource(url) { this._url = url; }
+      attachMedia(media) {}
+    };
+    Object.defineProperty(win.Hls.prototype, 'url', {
+      get() { return this._url || ''; }
+    });
+
+    return new Promise((resolve, reject) => {
+      setTimeout(() => {
+        try {
+          const hls = new win.Hls();
+          hls.loadSource('https://cdn.example.com/mutation-observer.m3u8');
+
+          const hlsIntercepts = intercepted.filter(m => m.source === 'hls_loadSource');
+          if (hlsIntercepts.length === 0) {
+            throw new Error('MutationObserver did not trigger Hls patching');
+          }
+          resolve();
+        } catch (e) { reject(e); }
+      }, 200);
+    });
+  });
+
+  it('should NOT re-patch Hls prototype if already patched (idempotent patch)', () => {
+    const dom = new JSDOM('<!DOCTYPE html><html><body></body></html>', {
+      url: 'https://example.com/watch',
+      runScripts: 'dangerously',
+    });
+    const win = dom.window;
+
+    const intercepted = [];
+    win.postMessage = (msg) => {
+      if (msg.type === 'GOON_PLUGIN_HLS_INTERCEPT') intercepted.push(msg);
+    };
+    win.fetch = () => {};
+
+    win.Hls = class {
+      loadSource(url) { this._url = url; }
+    };
+    Object.defineProperty(win.Hls.prototype, 'url', {
+      get() { return this._url || ''; }
+    });
+
+    // Load interceptors twice
+    win.eval(interceptorSource);
+    win.eval(interceptorSource);
+
+    win.fetch('https://cdn.example.com/stream.m3u8');
+
+    if (intercepted.length !== 1) {
+      throw new Error(`Expected 1 intercept after double injection, got ${intercepted.length}`);
+    }
+  });
+});
+
+/* ========================================================================== */
+/* Test: Content script message collection                                   */
+/* ========================================================================== */
+
+describe('HLS.js: Content script manifest collection', () => {
+  it('should collect manifests from postMessage (GOON_PLUGIN_HLS_INTERCEPT)', () => {
+    if (!contentSource.includes("event.data.type === 'GOON_PLUGIN_HLS_INTERCEPT'")) {
+      throw new Error('Content script missing GOON_PLUGIN_HLS_INTERCEPT message handler');
+    }
+    if (!contentSource.includes('interceptedSources.has(url)')) {
+      throw new Error('Content script does not deduplicate intercepted manifests');
+    }
+    if (!contentSource.includes('interceptedManifests.push')) {
+      throw new Error('Content script does not collect intercepted manifests');
+    }
+  });
+
+  it('should respond to GOON_GET_VIDEO_DATA with intercepted manifests', () => {
+    if (!contentSource.includes("message.type === 'GOON_GET_VIDEO_DATA'")) {
+      throw new Error('Content script missing GOON_GET_VIDEO_DATA message handler');
+    }
+    if (!contentSource.includes('interceptedManifests: interceptedManifests')) {
+      throw new Error('Content script does not return intercepted manifests in response');
+    }
+  });
+
+  it('should filter postMessage from non-self sources', () => {
+    if (!contentSource.includes('event.source !== window')) {
+      throw new Error('Content script does not filter iframe/cross-origin postMessages');
+    }
+  });
+
+  it('should inject interceptors via script.src (not inline textContent)', () => {
+    // Verify content.js uses script.src = chrome.runtime.getURL(...) pattern
+    // This is the CSP-safe approach vs inline script.textContent
+    const injectFn = contentSource.match(/function injectInterceptors\(\)[\s\S]*?\n\}/);
+    if (!injectFn) throw new Error('injectInterceptors function not found');
+
+    if (!injectFn[0].includes('script.src = chrome.runtime.getURL')) {
+      throw new Error('Content script does not use script.src = chrome.runtime.getURL for injection');
+    }
+
+    // Verify it does NOT set script.textContent (which CSP blocks)
+    // We check actual assignment, not comments — strip comments first
+    const noComments = injectFn[0].replace(/\/\*[\s\S]*?\*\//g, '').replace(/\/\/.*$/gm, '');
+    if (noComments.includes('script.textContent')) {
+      throw new Error('Content script uses inline script.textContent injection — blocked by CSP');
+    }
+  });
+});
+
+/* ========================================================================== */
+/* Test: Video playback state machine transitions                            */
+/* ========================================================================== */
+
+describe('HLS.js: Playback state machine', () => {
+  it('should transition from idle -> loading -> buffering -> playing on normal playback', () => {
+    const storageData = {};
+    const viewerId = 'test_state_machine';
+    storageData[viewerId] = [{ url: 'x', src: 'x', hlsManifest: 'https://cdn.example.com/stream.m3u8', mediaType: 'hls' }];
+    const url = `https://example.com/viewer/viewer.html?id=${viewerId}&grid=1`;
+    const { win, hlsCalls } = createBrowserEnv({ storageData, url, hlsMode: 'mocked' });
+
+    win.eval(viewerSource);
+
+    return new Promise((resolve, reject) => {
+      setTimeout(() => {
+        try {
+          const inst = hlsCalls.instances[0];
+          if (!inst) throw new Error('No HLS instance');
+
+          // 1. MEDIA_ATTACHED -> loading
+          inst.events['mediaAttached'][0]('mediaAttached');
+
+          // 2. MANIFEST_LOADED -> loading
+          inst.events['manifestLoaded'][0]('manifestLoaded', { levels: [{ width: 1280, height: 720 }] });
+
+          // 3. FRAG_LOADING (video.paused=true) -> buffering
+          const video = win.document.querySelector('video');
+          Object.defineProperty(video, 'paused', { value: true, configurable: true });
+          Object.defineProperty(video, 'readyState', { value: 1, configurable: true });
+          inst.events['fragLoading'][0]('fragLoading');
+
+          // 4. FRAG_BUFFERED (video not paused, readyState >= 3) -> playing
+          Object.defineProperty(video, 'paused', { value: false, configurable: true });
+          Object.defineProperty(video, 'readyState', { value: 4, configurable: true });
+          inst.events['fragBuffered'][0]('fragBuffered');
+
+          const overlay = win.document.querySelector('.panel-overlay');
+          if (!overlay) throw new Error('No panel overlay found');
+          if (!overlay.textContent.includes('playing')) {
+            throw new Error(`Expected overlay to show 'playing' state, got: ${overlay.textContent}`);
+          }
+
+          resolve();
+        } catch (e) { reject(e); }
+      }, 500);
+    });
+  });
+
+  it('should transition to switching state during level change', () => {
+    const storageData = {};
+    const viewerId = 'test_level_switch';
+    storageData[viewerId] = [{ url: 'x', src: 'x', hlsManifest: 'https://cdn.example.com/stream.m3u8', mediaType: 'hls' }];
+    const url = `https://example.com/viewer/viewer.html?id=${viewerId}&grid=1`;
+    const { win, hlsCalls } = createBrowserEnv({ storageData, url, hlsMode: 'mocked' });
+
+    win.eval(viewerSource);
+
+    return new Promise((resolve, reject) => {
+      setTimeout(() => {
+        try {
+          const inst = hlsCalls.instances[0];
+          const hls = inst.hlsInstance; // the actual mock instance
+
+          // Set levels on the actual Hls instance (viewer.js reads hls.levels)
+          // The mock instance is the one returned by the MockHLS constructor
+          // We need to set it on the real instance, not our tracking proxy
+          const levelSwitchedHandlers = inst.events['levelSwitched'];
+          if (!levelSwitchedHandlers) throw new Error('LEVEL_SWITCHED handler not registered');
+
+          // Simulate level switch
+          levelSwitchedHandlers[0]('levelSwitched', { level: 0 });
+
+          // Check overlay for switching state
+          const overlay = win.document.querySelector('.panel-overlay');
+          if (!overlay) throw new Error('No panel overlay');
+          if (!overlay.textContent.includes('switching')) {
+            throw new Error(`Expected 'switching' state during level change, got: ${overlay.textContent}`);
+          }
+
+          resolve();
+        } catch (e) { reject(e); }
+      }, 500);
+    });
+  });
+
+  it('should transition from any non-error state to playing on FRAG_BUFFERED', () => {
+    const storageData = {};
+    const viewerId = 'test_direct_playing';
+    storageData[viewerId] = [{ url: 'x', src: 'x', hlsManifest: 'https://cdn.example.com/stream.m3u8', mediaType: 'hls' }];
+    const url = `https://example.com/viewer/viewer.html?id=${viewerId}&grid=1`;
+    const { win, hlsCalls } = createBrowserEnv({ storageData, url, hlsMode: 'mocked' });
+
+    win.eval(viewerSource);
+
+    return new Promise((resolve, reject) => {
+      setTimeout(() => {
+        try {
+          const inst = hlsCalls.instances[0];
+          const video = win.document.querySelector('video');
+
+          Object.defineProperty(video, 'paused', { value: false, configurable: true });
+          Object.defineProperty(video, 'readyState', { value: 4, configurable: true });
+
+          const fragBufferedHandlers = inst.events['fragBuffered'];
+          if (!fragBufferedHandlers) throw new Error('FRAG_BUFFERED handler not registered');
+
+          fragBufferedHandlers[0]('fragBuffered');
+
+          const overlay = win.document.querySelector('.panel-overlay');
+          if (!overlay) throw new Error('No panel overlay');
+          if (!overlay.textContent.includes('playing')) {
+            throw new Error(`Expected direct transition to 'playing', got: ${overlay.textContent}`);
+          }
+
+          resolve();
+        } catch (e) { reject(e); }
+      }, 500);
+    });
+  });
+});
+
+/* ========================================================================== */
+/* Test: HLS.js error recovery                                                */
+/* ========================================================================== */
+
+describe('HLS.js: Error handling and recovery', () => {
+  it('should attempt media error recovery (not destroy instance)', () => {
+    const storageData = {};
+    const viewerId = 'test_media_err';
+    storageData[viewerId] = [{ url: 'x', src: 'x', hlsManifest: 'https://cdn.example.com/stream.m3u8', mediaType: 'hls' }];
+    const url = `https://example.com/viewer/viewer.html?id=${viewerId}&grid=1`;
+    const { win, hlsCalls } = createBrowserEnv({ storageData, url, hlsMode: 'mocked' });
+
+    win.eval(viewerSource);
+
+    return new Promise((resolve, reject) => {
+      setTimeout(() => {
+        try {
+          const inst = hlsCalls.instances[0];
+          if (!inst) throw new Error('No HLS instance');
+
+          const errorHandlers = inst.events['error'];
+          if (!errorHandlers) throw new Error('ERROR handler not registered');
+
+          // Simulate non-fatal media error (should recover, not destroy)
+          errorHandlers[0]('error', {
+            fatal: false,
+            type: 'mediaError',
+            details: 'fragParsingError',
+          });
+
+          if (inst.destroyed) {
+            throw new Error('HLS instance was destroyed on non-fatal media error — should have recovered');
+          }
+
+          resolve();
+        } catch (e) { reject(e); }
+      }, 500);
+    });
+  });
+
+  it('should destroy instance on fatal network error', () => {
+    const storageData = {};
+    const viewerId = 'test_net_err';
+    storageData[viewerId] = [{ url: 'x', src: 'x', hlsManifest: 'https://cdn.example.com/stream.m3u8', mediaType: 'hls' }];
+    const url = `https://example.com/viewer/viewer.html?id=${viewerId}&grid=1`;
+    const { win, hlsCalls } = createBrowserEnv({ storageData, url, hlsMode: 'mocked' });
+
+    win.eval(viewerSource);
+
+    return new Promise((resolve, reject) => {
+      setTimeout(() => {
+        try {
+          const inst = hlsCalls.instances[0];
+          const errorHandlers = inst.events['error'];
+
+          errorHandlers[0]('error', {
+            fatal: true,
+            type: 'networkError',
+            details: 'loadsource timeout',
+          });
+
+          if (!inst.destroyed) {
+            throw new Error('HLS instance should be destroyed on fatal network error');
+          }
+
+          const panelError = win.document.querySelector('.panel-error');
+          if (!panelError) {
+            throw new Error('Expected panel-error element for fatal network error');
+          }
+
+          resolve();
+        } catch (e) { reject(e); }
+      }, 500);
+    });
+  });
+
+  it('should track non-fatal fragment load failures (segmentsFailed++)', () => {
+    const storageData = {};
+    const viewerId = 'test_frag_fail';
+    storageData[viewerId] = [{ url: 'x', src: 'x', hlsManifest: 'https://cdn.example.com/stream.m3u8', mediaType: 'hls' }];
+    const url = `https://example.com/viewer/viewer.html?id=${viewerId}&grid=1`;
+    const { win, hlsCalls } = createBrowserEnv({ storageData, url, hlsMode: 'mocked' });
+
+    win.eval(viewerSource);
+
+    return new Promise((resolve, reject) => {
+      setTimeout(() => {
+        try {
+          const inst = hlsCalls.instances[0];
+          const errorHandlers = inst.events['error'];
+          const fragLoadedHandlers = inst.events['fragLoaded'];
+
+          // First load some segments so the overlay shows segment count
+          for (let i = 0; i < 5; i++) {
+            fragLoadedHandlers[0]('fragLoaded', { frag: { level: 0, sn: i } });
+          }
+
+          // Simulate non-fatal network errors (transient fragment failures)
+          errorHandlers[0]('error', { fatal: false, type: 'networkError', details: 'fragLoadError' });
+          errorHandlers[0]('error', { fatal: false, type: 'networkError', details: 'fragLoadError' });
+
+          const overlay = win.document.querySelector('.panel-overlay');
+          if (!overlay) throw new Error('No panel overlay');
+          // Should show segment count + failure count
+          if (!overlay.textContent.includes('5 seg')) {
+            throw new Error(`Expected '5 seg' in overlay after loading segments, got: ${overlay.textContent}`);
+          }
+          if (!overlay.textContent.includes('fail')) {
+            throw new Error(`Expected fragment failure tracking in overlay, got: ${overlay.textContent}`);
+          }
+
+          resolve();
+        } catch (e) { reject(e); }
+      }, 500);
+    });
+  });
+});
+
+/* ========================================================================== */
+/* Test: Manifest URL edge cases (query strings, protocol-relative, etc.)    */
+/* ========================================================================== */
+
+describe('HLS.js: Manifest URL edge cases', () => {
+  it('should intercept .m3u8 URLs with query string parameters', () => {
+    const dom = new JSDOM('<!DOCTYPE html><html><body></body></html>', {
+      url: 'https://example.com/watch',
+      runScripts: 'dangerously',
+    });
+    const win = dom.window;
+
+    const intercepted = [];
+    win.postMessage = (msg) => {
+      if (msg.type === 'GOON_PLUGIN_HLS_INTERCEPT') intercepted.push(msg);
+    };
+    win.fetch = () => {};
+
+    win.eval(interceptorSource);
+    win.fetch('https://cdn.example.com/stream.m3u8?token=abc123&expires=999999');
+
+    if (intercepted.length !== 1) {
+      throw new Error(`Expected 1 intercept for .m3u8 with query string, got ${intercepted.length}`);
+    }
+    if (!intercepted[0].url.includes('token=abc123')) {
+      throw new Error(`Query string should be preserved: ${intercepted[0].url}`);
+    }
+  });
+
+  it('should intercept protocol-relative manifest URLs (//cdn.example.com)', () => {
+    const dom = new JSDOM('<!DOCTYPE html><html><body></body></html>', {
+      url: 'https://example.com/watch',
+      runScripts: 'dangerously',
+    });
+    const win = dom.window;
+
+    const intercepted = [];
+    win.postMessage = (msg) => {
+      if (msg.type === 'GOON_PLUGIN_HLS_INTERCEPT') intercepted.push(msg);
+    };
+    win.fetch = () => {};
+
+    win.eval(interceptorSource);
+    win.fetch('//cdn.example.com/stream.m3u8');
+
+    if (intercepted.length !== 1) {
+      throw new Error(`Expected 1 intercept for protocol-relative URL, got ${intercepted.length}`);
+    }
+    if (!intercepted[0].url.startsWith('https://')) {
+      throw new Error(`Protocol-relative URL should be resolved to absolute: ${intercepted[0].url}`);
+    }
+  });
+
+  it('should intercept .hlsvod URLs (non-standard HLS extension)', () => {
+    const dom = new JSDOM('<!DOCTYPE html><html><body></body></html>', {
+      url: 'https://example.com/watch',
+      runScripts: 'dangerously',
+    });
+    const win = dom.window;
+
+    const intercepted = [];
+    win.postMessage = (msg) => {
+      if (msg.type === 'GOON_PLUGIN_HLS_INTERCEPT') intercepted.push(msg);
+    };
+    win.fetch = () => {};
+
+    win.eval(interceptorSource);
+    win.fetch('https://cdn.example.com/stream.hlsvod');
+
+    if (intercepted.length !== 1) {
+      throw new Error(`Expected 1 intercept for .hlsvod URL, got ${intercepted.length}`);
+    }
+  });
+
+  it('should intercept /hls/ path URLs', () => {
+    const dom = new JSDOM('<!DOCTYPE html><html><body></body></html>', {
+      url: 'https://example.com/watch',
+      runScripts: 'dangerously',
+    });
+    const win = dom.window;
+
+    const intercepted = [];
+    win.postMessage = (msg) => {
+      if (msg.type === 'GOON_PLUGIN_HLS_INTERCEPT') intercepted.push(msg);
+    };
+    win.fetch = () => {};
+
+    win.eval(interceptorSource);
+    win.fetch('https://cdn.example.com/hls/video/12345/master');
+
+    if (intercepted.length !== 1) {
+      throw new Error(`Expected 1 intercept for /hls/ path URL, got ${intercepted.length}`);
+    }
+  });
+
+  it('should use hlsManifest field even when src is not .m3u8', () => {
+    const storageData = {};
+    const viewerId = 'test_hls_field_priority';
+    storageData[viewerId] = [{
+      url: 'https://example.com/video/123',
+      src: 'https://example.com/video/123',
+      hlsManifest: 'https://cdn.example.com/stream.m3u8',
+      mediaType: 'hls',
+    }];
+    const url = `https://example.com/viewer/viewer.html?id=${viewerId}&grid=1`;
+    const { win, hlsCalls } = createBrowserEnv({ storageData, url, hlsMode: 'mocked' });
+
+    win.eval(viewerSource);
+
+    return new Promise((resolve, reject) => {
+      setTimeout(() => {
+        try {
+          const inst = hlsCalls.instances[0];
+          if (!inst) throw new Error('No HLS instance — hlsManifest field not used');
+          if (!inst.source || !inst.source.includes('stream.m3u8')) {
+            throw new Error(`Expected stream.m3u8 from hlsManifest, got: ${inst.source}`);
+          }
+          resolve();
+        } catch (e) { reject(e); }
+      }, 500);
+    });
+  });
+});
+
+/* ========================================================================== */
+/* Test: Deep probe deduplication and priority                               */
+/* ========================================================================== */
+
+describe('HLS.js: Deep probe deduplication', () => {
+  const probeMatch = indexSource.match(/function m3u8DeepProbeFn\(\)[\s\S]*?^}/m);
+  if (!probeMatch) throw new Error('Could not find m3u8DeepProbeFn in index.js');
+  const probeFnSource = probeMatch[0];
+
+  function runProbeInWin(win) {
+    const result = win.eval(`(${probeFnSource})();`);
+    if (!Array.isArray(result)) throw new Error(`m3u8DeepProbeFn did not return an array`);
+    return result;
+  }
+
+  it('should deduplicate manifest found via multiple strategies', () => {
+    const dom = new JSDOM('<!DOCTYPE html><html><body></body></html>', {
+      url: 'https://example.com/watch',
+      runScripts: 'dangerously',
+    });
+    const win = dom.window;
+
+    // Same URL via multiple detection strategies
+    win.hls = { url: 'https://cdn.example.com/stream.m3u8' };
+    win.__goon_plugin_data = {
+      manifests: ['https://cdn.example.com/stream.m3u8'],
+      sources: ['xhr'],
+    };
+    const script = win.document.createElement('script');
+    script.textContent = 'var m = "https://cdn.example.com/stream.m3u8";';
+    win.document.body.appendChild(script);
+
+    const results = runProbeInWin(win);
+
+    const duplicates = results.filter(r => r.url === 'https://cdn.example.com/stream.m3u8');
+    if (duplicates.length > 1) {
+      throw new Error(`Expected deduplication: manifest found ${duplicates.length} times across strategies`);
+    }
+    if (duplicates.length !== 1) {
+      throw new Error(`Manifest not found. Results: ${JSON.stringify(results)}`);
+    }
+  });
+
+  it('should deduplicate via interceptor strategy (seen Set prevents duplicates)', () => {
+    // The seen Set in m3u8DeepProbeFn ensures that once a URL is found by any
+    // earlier strategy, later strategies skip it. Strategy order: A(player globals),
+    // B(video elements), C(inline scripts), D(config globals), E(__goon_plugin_data).
+    // When __goon_plugin_data is the ONLY source, it should be the player label.
+    const dom = new JSDOM('<!DOCTYPE html><html><body></body></html>', {
+      url: 'https://example.com/watch',
+      runScripts: 'dangerously',
+    });
+    const win = dom.window;
+
+    // Only interceptor-collected data (Strategy E)
+    win.__goon_plugin_data = {
+      manifests: ['https://cdn.example.com/stream.m3u8'],
+      sources: ['xhr'],
+    };
+
+    const results = runProbeInWin(win);
+    const found = results.find(r => r.url === 'https://cdn.example.com/stream.m3u8');
+    if (!found) throw new Error('Manifest not found');
+    if (found.player !== '__goon_plugin_data') {
+      throw new Error(`Expected player=__goon_plugin_data, got: ${found.player}`);
+    }
+  });
+});
+
+/* ========================================================================== */
+/* Test: dedupManifests priority sorting                                     */
+/* ========================================================================== */
+
+describe('HLS.js: Manifest priority sorting', () => {
+  it('should sort manifests by priority: interceptor > player > inline-script', () => {
+    // Extract dedupManifests from index.js
+    const dedupMatch = indexSource.match(/function dedupManifests\(allManifests\)[\s\S]*?^}/m);
+    if (!dedupMatch) throw new Error('Could not find dedupManifests in index.js');
+
+    // Check playerRank values enforce correct priority
+    const rankMatch = indexSource.match(/const playerRank = \{[\s\S]*?\}/);
+    if (!rankMatch) throw new Error('Could not find playerRank in index.js');
+
+    const rankText = rankMatch[0];
+    // __goon_plugin_data should have lowest rank number (highest priority)
+    if (!rankText.includes("'__goon_plugin_data': 0")) {
+      throw new Error('__goon_plugin_data should have rank 0 (highest priority)');
+    }
+    // inline-script should have highest rank number (lowest priority)
+    if (!rankText.includes("'inline-script': 99")) {
+      throw new Error('inline-script should have rank 99 (lowest priority)');
+    }
+  });
+
+  it('should filter out .ts segment URLs, keeping only manifests', () => {
+    const filterMatch = indexSource.match(/function filterManifests\(manifests\)[\s\S]*?^}/m);
+    if (!filterMatch) throw new Error('Could not find filterManifests in index.js');
+
+    const filterText = filterMatch[0];
+    // Should filter by .m3u8 / .hlsvod extensions
+    if (!filterText.includes('.m3u8') || !filterText.includes('.hlsvod')) {
+      throw new Error('filterManifests should check for .m3u8 and .hlsvod extensions');
+    }
+    // Should handle .ts segment URLs separately
+    if (!filterText.includes('.ts')) {
+      throw new Error('filterManifests should handle .ts segment URLs');
+    }
+  });
+});
+
+/* ========================================================================== */
+/* Test: End-to-end interceptor -> deep probe pipeline                       */
+/* ========================================================================== */
+
+describe('HLS.js: End-to-end detection pipeline', () => {
+  it('should collect intercepted manifests and pass them to deep probe', () => {
+    // Pipeline verification:
+    // 1. interceptors.js -> window.__goon_plugin_data.manifests[]
+    if (!interceptorSource.includes('window.__goon_plugin_data.manifests')) {
+      throw new Error('interceptors.js does not write to __goon_plugin_data.manifests');
+    }
+    // 2. m3u8DeepProbeFn reads from __goon_plugin_data.manifests
+    if (!indexSource.includes('window.__goon_plugin_data.manifests')) {
+      throw new Error('m3u8DeepProbeFn does not read from __goon_plugin_data.manifests');
+    }
+    // 3. content.js collects from postMessage
+    if (!contentSource.includes('interceptedManifests')) {
+      throw new Error('content.js does not track intercepted manifests');
+    }
+    // 4. viewer.js uses hlsManifest from storage
+    if (!viewerSource.includes('hlsManifest')) {
+      throw new Error('viewer.js does not use hlsManifest field');
+    }
+  });
+
+  it('should handle the full hls.js lifecycle: create -> play -> error -> recover -> destroy', () => {
+    const lifecycleSteps = [
+      { step: 'create HLS instance', pattern: /new window\.Hls\(HLS_CONFIG\)/ },
+      { step: 'loadSource', pattern: /hls\.loadSource/ },
+      { step: 'attachMedia', pattern: /hls\.attachMedia/ },
+      { step: 'wireHlsEvents', pattern: /wireHlsEvents\(hls/ },
+      { step: 'wireVideoEvents', pattern: /wireVideoEvents\(video\)/ },
+      { step: 'startBufferMonitor', pattern: /startBufferMonitor\(video/ },
+      { step: 'destroy on error', pattern: /hls\.destroy\(\)/ },
+      { step: 'recoverMediaError', pattern: /hls\.recoverMediaError\(\)/ },
+      { step: 'destroy on unload', pattern: /destroyHls/ },
+    ];
+
+    for (const { step, pattern } of lifecycleSteps) {
+      if (!pattern.test(viewerSource)) {
+        throw new Error(`Missing lifecycle step: ${step}`);
+      }
+    }
+  });
+});
+
+/* ========================================================================== */
+/* Test: Fragment tracking accuracy                                          */
+/* ========================================================================== */
+
+describe('HLS.js: Fragment tracking accuracy', () => {
+  it('should correctly count segments loaded via FRAG_LOADED events', () => {
+    const storageData = {};
+    const viewerId = 'test_seg_count';
+    storageData[viewerId] = [{ url: 'x', src: 'x', hlsManifest: 'https://cdn.example.com/stream.m3u8', mediaType: 'hls' }];
+    const url = `https://example.com/viewer/viewer.html?id=${viewerId}&grid=1`;
+    const { win, hlsCalls } = createBrowserEnv({ storageData, url, hlsMode: 'mocked' });
+
+    win.eval(viewerSource);
+
+    return new Promise((resolve, reject) => {
+      setTimeout(() => {
+        try {
+          const inst = hlsCalls.instances[0];
+          const fragLoadedHandlers = inst.events['fragLoaded'];
+
+          for (let i = 0; i < 5; i++) {
+            fragLoadedHandlers[0]('fragLoaded', { frag: { level: 0, sn: i } });
+          }
+
+          const overlay = win.document.querySelector('.panel-overlay');
+          if (!overlay) throw new Error('No panel overlay');
+          if (!overlay.textContent.includes('5 seg')) {
+            throw new Error(`Expected '5 seg' in overlay, got: ${overlay.textContent}`);
+          }
+
+          resolve();
+        } catch (e) { reject(e); }
+      }, 500);
+    });
+  });
+
+  it('should reset segment count on BUFFER_RESET event', () => {
+    const storageData = {};
+    const viewerId = 'test_buf_reset';
+    storageData[viewerId] = [{ url: 'x', src: 'x', hlsManifest: 'https://cdn.example.com/stream.m3u8', mediaType: 'hls' }];
+    const url = `https://example.com/viewer/viewer.html?id=${viewerId}&grid=1`;
+    const { win, hlsCalls } = createBrowserEnv({ storageData, url, hlsMode: 'mocked' });
+
+    win.eval(viewerSource);
+
+    return new Promise((resolve, reject) => {
+      setTimeout(() => {
+        try {
+          const inst = hlsCalls.instances[0];
+
+          // Load some segments first
+          for (let i = 0; i < 3; i++) {
+            inst.events['fragLoaded'][0]('fragLoaded', { frag: { level: 0, sn: i } });
+          }
+
+          // Trigger BUFFER_RESET
+          inst.events['bufferReset'][0]('bufferReset');
+
+          const overlay = win.document.querySelector('.panel-overlay');
+          if (!overlay) throw new Error('No panel overlay');
+          // After buffer reset, segmentsLoaded should be 0
+          if (overlay.textContent.includes('3 seg')) {
+            throw new Error(`Expected segment count to reset after BUFFER_RESET, still shows '3 seg'`);
+          }
+
+          resolve();
+        } catch (e) { reject(e); }
+      }, 500);
+    });
+  });
+
+  it('should track buffer health updates via BUFFER_APPENDED', () => {
+    const storageData = {};
+    const viewerId = 'test_buf_append';
+    storageData[viewerId] = [{ url: 'x', src: 'x', hlsManifest: 'https://cdn.example.com/stream.m3u8', mediaType: 'hls' }];
+    const url = `https://example.com/viewer/viewer.html?id=${viewerId}&grid=1`;
+    const { win, hlsCalls } = createBrowserEnv({ storageData, url, hlsMode: 'mocked' });
+
+    win.eval(viewerSource);
+
+    return new Promise((resolve, reject) => {
+      setTimeout(() => {
+        try {
+          const inst = hlsCalls.instances[0];
+
+          inst.events['bufferAppended'][0]('bufferAppended');
+
+          const overlay = win.document.querySelector('.panel-overlay');
+          if (!overlay) throw new Error('No panel overlay');
+          if (!overlay.textContent.includes('buf')) {
+            throw new Error(`Expected buffer info in overlay, got: ${overlay.textContent}`);
+          }
+
+          resolve();
+        } catch (e) { reject(e); }
+      }, 500);
+    });
+  });
+});

__tests__/instructions_ui.test.mjs

@@ -0,0 +1,204 @@
+import { describe, it } from './runner.mjs';
+import { JSDOM } from 'jsdom';
+
+const POPUP_HTML = `
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>VidPlex</title>
+</head>
+<body>
+  <div id="app">
+    <h1>VidPlex</h1>
+    <section class="instructions-panel" role="region" aria-labelledby="instructions-title">
+      <div class="instructions-header">
+        <div>
+          <p class="instructions-kicker">Quick start</p>
+          <h2 id="instructions-title">How to use VidPlex</h2>
+        </div>
+        <button
+          id="instructions-toggle"
+          type="button"
+          class="instructions-toggle"
+          aria-expanded="true"
+          aria-controls="instructions-body"
+        >
+          Hide instructions
+        </button>
+      </div>
+      <div id="instructions-body" class="instructions-body">
+        <ol class="instructions-list">
+          <li>
+            <strong>Scan videos</strong>
+            <span>Click <strong>Find Videos</strong> to search the current browser window for videos.</span>
+          </li>
+          <li>
+            <strong>Review the list</strong>
+            <span>Check the popup list; each found video URL is clickable.</span>
+          </li>
+          <li>
+            <strong>Open the viewer</strong>
+            <span>Click <strong>Open Viewer</strong> to open the 2x2 grid player in a new window.</span>
+          </li>
+          <li>
+            <strong>Reset and rescan</strong>
+            <span>Click <strong>Clear</strong> to erase results and scan again.</span>
+          </li>
+        </ol>
+        <p class="instructions-note">Warning: Browser pages, extension pages, and restricted frames can hide videos, so results may be incomplete.</p>
+        <p class="instructions-learn-more">Learn more tooltip: Read the VidPlex README and audit notes.</p>
+      </div>
+    </section>
+    <button id="find-btn">Find Videos (all tabs)</button>
+    <div id="video-list" class="video-list" style="display:none;"></div>
+    <div id="status" class="status" style="min-height:16px;"></div>
+    <div id="btn-row" class="btn-row" style="display:none;">
+      <button id="clear-btn" class="btn-secondary">Clear</button>
+      <button id="open-btn">Open Viewer</button>
+    </div>
+  </div>
+</body>
+</html>`;
+
+function installPopupDom() {
+  const dom = new JSDOM(POPUP_HTML, { url: 'chrome-extension://test/src/viewer/index.html' });
+  const previous = {
+    window: globalThis.window,
+    document: globalThis.document,
+    navigator: globalThis.navigator,
+    chrome: globalThis.chrome,
+    HTMLElement: globalThis.HTMLElement,
+    Node: globalThis.Node,
+  };
+
+  globalThis.window = dom.window;
+  globalThis.document = dom.window.document;
+  Object.defineProperty(globalThis, 'navigator', {
+    value: dom.window.navigator,
+    configurable: true,
+    writable: true,
+  });
+  Object.defineProperty(globalThis, 'HTMLElement', {
+    value: dom.window.HTMLElement,
+    configurable: true,
+    writable: true,
+  });
+  Object.defineProperty(globalThis, 'Node', {
+    value: dom.window.Node,
+    configurable: true,
+    writable: true,
+  });
+  globalThis.chrome = {
+    storage: {
+      local: {
+        get: async () => ({}),
+        set: async () => undefined,
+        remove: async () => undefined,
+      },
+    },
+    tabs: { query: async () => [] },
+    scripting: { executeScript: async () => [] },
+    runtime: { getURL: (path) => `chrome-extension://test/${path}` },
+    windows: { create: async () => ({ id: 1 }) },
+  };
+
+  return {
+    dom,
+    cleanup() {
+      dom.window.close();
+      globalThis.window = previous.window;
+      globalThis.document = previous.document;
+      Object.defineProperty(globalThis, 'navigator', {
+        value: previous.navigator,
+        configurable: true,
+        writable: true,
+      });
+      globalThis.chrome = previous.chrome;
+      Object.defineProperty(globalThis, 'HTMLElement', {
+        value: previous.HTMLElement,
+        configurable: true,
+        writable: true,
+      });
+      Object.defineProperty(globalThis, 'Node', {
+        value: previous.Node,
+        configurable: true,
+        writable: true,
+      });
+    },
+  };
+}
+
+async function mountPopup() {
+  const { dom, cleanup } = installPopupDom();
+  const moduleUrl = new URL('../src/viewer/index.js?test=' + Date.now(), import.meta.url);
+  await import(moduleUrl.href);
+  return { dom, cleanup };
+}
+
+describe('Viewer popup instructions', () => {
+  it('renders the drafted instructions copy on mount with accessible labeling', async () => {
+    const { dom, cleanup } = await mountPopup();
+    try {
+      const doc = dom.window.document;
+      const region = doc.querySelector('.instructions-panel');
+      const title = doc.getElementById('instructions-title');
+      const toggle = doc.getElementById('instructions-toggle');
+      const body = doc.getElementById('instructions-body');
+
+      if (!region) throw new Error('Instructions region missing');
+      if (region.getAttribute('role') !== 'region') throw new Error('Instructions region missing role="region"');
+      if (region.getAttribute('aria-labelledby') !== 'instructions-title') throw new Error('Instructions region missing aria-labelledby');
+      if (!title || title.textContent !== 'How to use VidPlex') throw new Error('Instructions title not rendered');
+      if (!toggle) throw new Error('Instructions toggle missing');
+      if (toggle.getAttribute('aria-controls') !== 'instructions-body') throw new Error('Toggle missing aria-controls');
+      if (toggle.getAttribute('aria-expanded') !== 'true') throw new Error('Toggle should start expanded');
+      if (!body || body.hidden) throw new Error('Instructions body should be visible on mount');
+
+      const expectedTexts = [
+        'Scan videos',
+        'Click Find Videos to search the current browser window for videos.',
+        'Review the list',
+        'Check the popup list; each found video URL is clickable.',
+        'Open the viewer',
+        'Click Open Viewer to open the 2x2 grid player in a new window.',
+        'Reset and rescan',
+        'Click Clear to erase results and scan again.',
+        'Warning: Browser pages, extension pages, and restricted frames can hide videos, so results may be incomplete.',
+        'Learn more tooltip: Read the VidPlex README and audit notes.',
+      ];
+
+      for (const text of expectedTexts) {
+        if (!doc.body.textContent.includes(text)) {
+          throw new Error(`Missing instructions copy: ${text}`);
+        }
+      }
+    } finally {
+      cleanup();
+    }
+  });
+
+  it('toggles the instructions panel open and closed', async () => {
+    const { dom, cleanup } = await mountPopup();
+    try {
+      const doc = dom.window.document;
+      const toggle = doc.getElementById('instructions-toggle');
+      const body = doc.getElementById('instructions-body');
+
+      if (!toggle || !body) throw new Error('Instructions controls missing');
+
+      toggle.click();
+      if (toggle.getAttribute('aria-expanded') !== 'false') throw new Error('Toggle should collapse the instructions');
+      if (!body.hidden) throw new Error('Instructions body should be hidden after collapse');
+      if (toggle.textContent !== 'Show instructions') throw new Error('Collapsed label should switch to Show instructions');
+
+      toggle.click();
+      if (toggle.getAttribute('aria-expanded') !== 'true') throw new Error('Toggle should expand the instructions');
+      if (body.hidden) throw new Error('Instructions body should be visible after expanding');
+      if (toggle.textContent !== 'Hide instructions') throw new Error('Expanded label should switch back to Hide instructions');
+    } finally {
+      cleanup();
+    }
+  });
+});

__tests__/referer_proxy.test.mjs

@@ -0,0 +1,364 @@
+/**
+ * referer_proxy.test.mjs — coverage for the background worker's per-CDN-host
+ * referer capture + DNR proxy-host learning, added in PR #5.
+ *
+ * The background worker is not itself a module, so the test transpiles it into
+ * one (wrapping + top-level-statement `async function` transpile) under a mocked
+ * `chrome` + `fetch`/`btoa` environment, then exercises the captured listeners
+ * and the message handler directly.
+ *
+ * Covers the three gaps robot flagged:
+ *  (a) closing a tab must NOT wipe the host-keyed `goon_referers` global store,
+ *  (b) two hosts proxied concurrently must each keep their OWN referer (no race
+ *      that leaves host B's referer live for host A -> 412),
+ *  (c) the new referer-capture / proxy-host-learning / onRemoved paths run.
+ */
+import { describe, it } from './runner.mjs';
+import { readFileSync, writeFileSync } from 'node:fs';
+import { fileURLToPath, pathToFileURL } from 'node:url';
+import { dirname, join } from 'node:path';
+import { tmpdir } from 'node:os';
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const backgroundSource = readFileSync(join(__dirname, '../src/background/background.js'), 'utf8');
+
+// Transpile the top-level-statement worker into an ES module. Wrapping in an
+// async IIFE makes its top-level `async function` declarations + `await`-using
+// nested functions legal inside a module.
+function buildModule(code) {
+  return `(async () => {\n${code}\n})();\n`;
+}
+
+  // A fresh mock of the chrome APIs the worker touches. `onBeforeRequest` and
+  // `tabs.onRemoved` capture their listener, and `tabs.get` serves the source
+  // tab's URL (the captured referer); `declarativeNetRequest.updateSessionRules`
+  // records the live rules.
+function makeChromeEnv() {
+  const storage = {};
+  const handlers = { onMessage: [] };
+  const tabUrls = {};
+  let sessionRules = {};
+
+  const webRequest = {
+    onBeforeRequest: { addListener: (cb) => { handlers.onBeforeRequest = cb; } },
+    };
+
+  const chrome = {
+    storage: {
+     local: {
+      get: async (keys) => {
+        const out = {};
+        const arr = Array.isArray(keys) ? keys : (keys === undefined ? Object.keys(storage) : [keys]);
+        for (const k of arr) if (k in storage) out[k] = storage[k];
+        return out;
+        },
+      set: async (data) => {
+        for (const [k, v] of Object.entries(data)) storage[k] = v;
+        },
+      remove: async (keys) => {
+        const arr = Array.isArray(keys) ? keys : [keys];
+        for (const k of arr) delete storage[k];
+        },
+      },
+     },
+    webRequest,
+     tabs: {
+      get: async (tabId) => tabUrls[tabId] ? { tabId, url: tabUrls[tabId] } : undefined,
+      onRemoved: { addListener: (cb) => { handlers.onRemoved = cb; } },
+       },
+    runtime: { onMessage: { addListener: (cb) => { handlers.onMessage.push(cb); } } },
+    declarativeNetRequest: {
+      updateSessionRules: async ({ removeRuleIds = [], addRules = [] } = {}) => {
+        const rm = new Set(removeRuleIds);
+        sessionRules = Object.fromEntries(
+          Object.entries(sessionRules).filter(([id]) => !rm.has(id))
+         );
+        for (const r of addRules) sessionRules[r.id] = r;
+        },
+      },
+   };
+
+  return { chrome, handlers, storage, tabUrls,
+     setTabUrl: (tabId, url) => { tabUrls[tabId] = url; },
+     getSessionRules: () => sessionRules };
+}
+
+// Load the worker into a fresh environment. `data:` URLs are cached by Node, so
+// the module body (listener registration) would only run once; instead we write
+// a uniquely-named temp file per load so each call registers into its own env.
+let loadCounter = 0;
+async function loadBackground(env) {
+  global.chrome = env.chrome;
+  const file = join(tmpdir(), `goon_bg_${process.pid}_${loadCounter++}.mjs`);
+  writeFileSync(file, buildModule(backgroundSource));
+  const module = await import(pathToFileURL(file).href);
+  await module.default;
+  return module;
+}
+
+// Drive a referer capture the way the worker now does it: the worker reads the
+// source tab's URL (via chrome.tabs.get) as the provider referer, so we set the
+// tab's URL and fire an onBeforeRequest for a video URL on that tab.
+async function capture(env, videoUrl, referer) {
+  env.setTabUrl(11, referer);
+  await env.handlers.onBeforeRequest({ tabId: 11, url: videoUrl });
+}
+
+describe('PR#5: per-host referer capture + proxy race', () => {
+   // (a) Blocking fix: a host-keyed `goon_referers` entry must outlive the close
+   // of ANY tab — including a different tab.
+  it('closing a tab does not wipe goon_referers captured for another host', async () => {
+    const env = makeChromeEnv();
+    global.chrome = env.chrome;
+    await loadBackground(env);
+
+      // A live source tab captures the provider referer for its CDN host.
+    await capture(env, 'https://cdnA.example.com/hls/live/seg-1.ts', 'https://pageA.example.com/watch');
+
+    const rA = env.storage['goon_referers']?.['example.com'];
+    if (!rA) throw new Error('referer was not captured for cdnA');
+    if (rA.referer !== 'https://pageA.example.com/watch') {
+      throw new Error('captured referer wrong: ' + JSON.stringify(rA));
+      }
+
+      // A DIFFERENT tab closes. The per-tab cleanup must NOT remove goon_referers.
+    await env.handlers.onRemoved(22);
+
+    const after = env.storage['goon_referers'];
+    if (!after || !after['example.com']) {
+      throw new Error('closing tab 22 wiped goon_referers — host A referer lost');
+      }
+      if (after['example.com'].referer !== 'https://pageA.example.com/watch') {
+       throw new Error('closing tab 22 corrupted the host A referer: ' + JSON.stringify(after));
+       }
+   });
+
+  it('closing the capturing tab itself preserves the referer for later proxy use', async () => {
+    const env = makeChromeEnv();
+    global.chrome = env.chrome;
+    await loadBackground(env);
+
+    await capture(env, 'https://cdnB.example.com/video/x/master.m3u8', 'https://pageB.example.com/v');
+
+       // The very tab that captured the referer now closes.
+    await env.handlers.onRemoved(11);
+
+    const after = env.storage['goon_referers']?.['example.com'];
+    if (!after) throw new Error('goon_referers for the capturing host was wiped on its own tab close');
+    if (after.referer !== 'https://pageB.example.com/v') {
+      throw new Error('capturing-tab close corrupted referer: ' + JSON.stringify(after));
+     }
+   });
+
+   // (b) Should-fix + coverage: two hosts proxied concurrently must each keep
+   // their own referer. With a shared rule id + non-atomic install this regressed;
+   // per-host rule ids + the per-host lock keep them distinct.
+  it('concurrent proxy fetches for two distinct registrable domains keep distinct referer rules', async () => {
+    const env = makeChromeEnv();
+    let fetchCalls = 0;
+    global.chrome = env.chrome;
+     global.fetch = async (url) => {
+      fetchCalls++;
+      return {
+        ok: true,
+        status: 200,
+        headers: { get: () => 'application/vnd.apple.mpegurl' },
+        arrayBuffer: async () => new Uint8Array([0]).buffer,
+       };
+     };
+
+    await loadBackground(env);
+
+      // Two GOON_PROXY_FETCH messages for different CDN hosts, fired together.
+    const handler = env.handlers.onMessage[env.handlers.onMessage.length - 1];
+    let respA, respB;
+    handler({ type: 'GOON_PROXY_FETCH', url: 'https://cdnA.example.com/hls/live/seg-1.ts', referer: 'https://pageA.example.com/watch' }, {}, (r) => { respA = r; });
+    handler({ type: 'GOON_PROXY_FETCH', url: 'https://cdnB.other.com/hls/live/seg-1.ts', referer: 'https://pageB.other.com/watch' }, {}, (r) => { respB = r; });
+
+     await new Promise(r => setTimeout(r, 30)); // let async sends + installs flush
+
+    if (!respA || !respA.ok) throw new Error('proxy A failed: ' + JSON.stringify(respA));
+    if (!respB || !respB.ok) throw new Error('proxy B failed: ' + JSON.stringify(respB));
+    if (fetchCalls < 2) throw new Error('expected both proxy fetches to run, got ' + fetchCalls);
+
+    // Each host must have its OWN installed DNR rule with its OWN referer —
+    // host A must NOT be served host B's referer (the 412 regression).
+     const rules = env.getSessionRules();
+    const ruleA = Object.values(rules).find(r => r.condition?.requestDomains?.includes('example.com'));
+    const ruleB = Object.values(rules).find(r => r.condition?.requestDomains?.includes('other.com'));
+    if (!ruleA) throw new Error('no DNR rule installed for cdna; rules=' + JSON.stringify(rules));
+    if (!ruleB) throw new Error('no DNR rule installed for cdnb; rules=' + JSON.stringify(rules));
+    if (ruleA.id === ruleB.id) {
+      throw new Error('cdnA and cdnB shared a DNR rule id -> concurrent race possible');
+     }
+    const refA = ruleA.action.requestHeaders?.find(h => h.header.toLowerCase() === 'referer')?.value;
+    const refB = ruleB.action.requestHeaders?.find(h => h.header.toLowerCase() === 'referer')?.value;
+    if (refA !== 'https://pageA.example.com/watch') {
+      throw new Error('cdnA served wrong referer: ' + refA);
+     }
+    if (refB !== 'https://pageB.other.com/watch') {
+      throw new Error('cdnB served wrong referer: ' + refB);
+     }
+    if (refA === refB) throw new Error('both hosts got the same referer — cross-host bleed');
+   });
+
+  it('repeated proxy for the same host is idempotent (one rule, one install)', async () => {
+    const env = makeChromeEnv();
+    let installs = 0;
+    env.chrome.declarativeNetRequest.updateSessionRules = async ({ addRules = [] } = {}) => {
+      for (const r of addRules) installs++;
+     };
+    global.chrome = env.chrome;
+    global.fetch = async () => ({
+      ok: true, status: 200,
+      headers: { get: () => 'application/vnd.apple.mpegurl' },
+      arrayBuffer: async () => new Uint8Array([0]).buffer,
+     });
+
+    await loadBackground(env);
+    const handler = env.handlers.onMessage[env.handlers.onMessage.length - 1];
+
+    const run = async (n) => {
+      handler(
+        { type: 'GOON_PROXY_FETCH', url: 'https://cdnA.example.com/hls/live/seg-1.ts', referer: 'https://pageA.example.com/watch' },
+        {},
+        () => {}
+       );
+      await new Promise(r => setTimeout(r, 5));
+     };
+    await run(1);
+    const installsAfterFirst = installs;
+    await run(2);
+    await run(3);
+
+     // Same host + same referer should not re-add the rule on repeat fetches.
+    if (installs !== installsAfterFirst) {
+      throw new Error(`expected idempotent install, but re-added rule ${installs - installsAfterFirst} extra time(s)`);
+     }
+   });
+
+   // (c) Domain generalization — the core 412 fix. A provider referer captured for
+   // ONE edge subdomain must cover a SIBLING subdomain: the DNR rule is scoped to
+   // the registrable domain and the store is domain-keyed, so a proxy for ev-h
+   // needs no per-subdomain capture.
+  it('a proxy for a sibling subdomain reuses the captured referer via the registrable domain', async () => {
+    const env = makeChromeEnv();
+    global.chrome = env.chrome;
+    global.fetch = async () => ({
+      ok: true,
+      status: 200,
+      headers: { get: () => 'application/vnd.apple.mpegurl' },
+      arrayBuffer: async () => new Uint8Array([0]).buffer,
+       });
+    await loadBackground(env);
+
+       // Capture the provider referer for hv-h.example.net (one edge subdomain).
+    await capture(env, 'https://hv-h.example.net/hls/live/seg-1.ts', 'https://provider.example.com/watch');
+
+       // Proxy a SIBLING subdomain ev-h.example.net with NO referer in the message:
+     // the SW must resolve it from the domain-keyed store.
+    const handler = env.handlers.onMessage[env.handlers.onMessage.length - 1];
+    let resp;
+    handler({ type: 'GOON_PROXY_FETCH', url: 'https://ev-h.example.net/hls/live/seg-1.ts' }, {}, (r) => { resp = r; });
+    await new Promise(r => setTimeout(r, 20));
+
+    if (!resp || !resp.ok) throw new Error('sibling proxy failed: ' + JSON.stringify(resp));
+    const rules = env.getSessionRules();
+    const rule = Object.values(rules).find(r => r.condition?.requestDomains?.includes('example.net'));
+    if (!rule) throw new Error('no domain-scoped DNR rule for example.net; rules=' + JSON.stringify(rules));
+    const ref = rule.action.requestHeaders?.find(h => h.header.toLowerCase() === 'referer')?.value;
+    if (ref !== 'https://provider.example.com/watch') {
+      throw new Error('sibling edge served wrong referer: ' + ref);
+       }
+     // The rule is scoped to the registrable domain, NOT the exact subdomain.
+    if (rule.condition.requestDomains?.includes('ev-h.example.net')) {
+      throw new Error('rule scoped to exact subdomain instead of registrable domain');
+       }
+    });
+
+   // (d) With no captured referer and none in the message, install NO rule: the
+   // self-origin fallback (guaranteed-wrong for hotlink protection) is dropped.
+  it('no captured referer and no message referer installs no DNR rule', async () => {
+    const env = makeChromeEnv();
+    let fetchCalls = 0;
+    global.chrome = env.chrome;
+    global.fetch = async () => {
+      fetchCalls++;
+      return {
+        ok: true,
+        status: 200,
+        headers: { get: () => 'application/vnd.apple.mpegurl' },
+        arrayBuffer: async () => new Uint8Array([0]).buffer,
+         };
+       };
+    await loadBackground(env);
+    const handler = env.handlers.onMessage[env.handlers.onMessage.length - 1];
+    let resp;
+    handler({ type: 'GOON_PROXY_FETCH', url: 'https://cdnA.example.com/hls/live/seg-1.ts' }, {}, (r) => { resp = r; });
+    await new Promise(r => setTimeout(r, 20));
+
+    if (!resp || !resp.ok) throw new Error('proxy fetch failed: ' + JSON.stringify(resp));
+    if (fetchCalls < 1) throw new Error('proxy fetch did not run');
+    const rules = env.getSessionRules();
+    if (Object.keys(rules).length !== 0) {
+      throw new Error('installed a rule with no referer (self-origin fallback not dropped): ' + JSON.stringify(rules));
+       }
+    });
+
+   // (e) GOON_GET_REFERERS (used by scan-time capture) resolves each manifest host
+   // via the domain-keyed store: a sibling subdomain gets the provider referer,
+   // and an uncaptured host is omitted.
+  it('GOON_GET_REFERERS resolves manifest hosts through the domain-keyed store', async () => {
+    const env = makeChromeEnv();
+    global.chrome = env.chrome;
+    await loadBackground(env);
+
+        // Capture for hv-h.example.net only.
+    await capture(env, 'https://hv-h.example.net/hls/live/seg-1.ts', 'https://provider.example.com/watch');
+
+    const handler = env.handlers.onMessage[env.handlers.onMessage.length - 1];
+    let resp;
+    handler(
+       { type: 'GOON_GET_REFERERS', hosts: ['ev-h.example.net', 'hv-h.example.net', 'cdnA.example.com'] },
+       {},
+       (r) => { resp = r; });
+    await new Promise(r => setTimeout(r, 15));
+
+    if (!resp || !resp.ok) throw new Error('GOON_GET_REFERERS failed: ' + JSON.stringify(resp));
+    const referers = resp.referers || {};
+    if (referers['ev-h.example.net'] !== 'https://provider.example.com/watch') {
+      throw new Error('sibling subdomain did not resolve the captured referer: ' + JSON.stringify(referers));
+       }
+    if (referers['hv-h.example.net'] !== 'https://provider.example.com/watch') {
+      throw new Error('captured subdomain did not resolve its own referer: ' + JSON.stringify(referers));
+       }
+    if ('cdnA.example.com' in referers) {
+      throw new Error('uncaptured host should be omitted from referers: ' + JSON.stringify(referers));
+       }
+    });
+
+     // Regression for the live 412 bug: the worker captures the provider referer
+     // from the source tab's URL via chrome.tabs.get inside onBeforeRequest. The
+     // old path read request headers via onBeforeSendHeaders + extraInfoSpec, which
+     // is rejected by some Chromium builds and fails the whole service worker, so it
+     // was removed; this asserts the new tab-URL capture is wired up and actually
+     // stores a referer.
+   it('the onBeforeRequest capture reads the referer from the source tab URL', async () => {
+     const env = makeChromeEnv();
+     global.chrome = env.chrome;
+     await loadBackground(env);
+
+     const cap = env.handlers.onBeforeRequest;
+     if (!cap) throw new Error('onBeforeRequest listener was not registered');
+
+     // A video request for cdnA from a tab whose URL IS the provider referer.
+     env.setTabUrl(11, 'https://pageA.example.com/watch');
+     await cap({ tabId: 11, url: 'https://cdnA.example.com/hls/live/seg-1.ts' });
+
+     const rA = env.storage['goon_referers']?.['example.com'];
+     if (!rA) throw new Error('referer was not captured from the source tab URL');
+     if (rA.referer !== 'https://pageA.example.com/watch') {
+       throw new Error('captured referer wrong: ' + JSON.stringify(rA));
+        }
+     });
+   });

__tests__/run.mjs

@@ -3,8 +3,13 @@
  */
 import './schema.test.mjs';
 import './viewer_units.test.mjs';
+import './instructions_ui.test.mjs';
 import './data_flow.test.mjs';
 import './viewer_integration.test.mjs';
+import './config_validation.test.mjs';
+import './hls_qa.test.mjs';
+import './simple_video.test.mjs';
+import './referer_proxy.test.mjs';
 import { run } from './runner.mjs';
 
 const result = await run();

__tests__/schema.test.mjs

@@ -1,7 +1,10 @@
 import { describe, it } from './runner.mjs';
 import Ajv from 'ajv';
 import addFormats from 'ajv-formats';
-import schema from '../src/viewer/schema.json' with { type: 'json' };
+import { readFileSync } from 'node:fs';
+import { fileURLToPath } from 'node:url';
+import { dirname, join } from 'node:path';
+const schema = JSON.parse(readFileSync(join(dirname(fileURLToPath(import.meta.url)), '../src/viewer/schema.json'), 'utf8'));
 
 const ajv = new Ajv({ strict: false });
 addFormats(ajv);

__tests__/simple_video.test.mjs

@@ -0,0 +1,131 @@
+// Regression tests: simple <video> / direct-media detection.
+//
+// The feature branch broke detection of pages that expose a plain <video>
+// (e.g. a site that serves a direct MP4 with a TRAILING SLASH and a
+// ?rnd= query: .../14644093/14644093.mp4/?rnd=...). Two site-agnostic fixes
+// are guarded here:
+//   1) The URL predicate (isValidManifestUrl) must let concrete media signals
+//      (.mp4/.m3u8/.webm/... and /hls/) WIN over the placeholder/`%`/trailing-
+//      slash rejections, so a real direct-media URL is not mistaken for a
+//      route template.
+//   2) scrapeTab must fall back to an ISOLATED-world scrape when the MAIN-world
+//      scrape yields nothing — the runtime cause of "detects nothing" on such pages
+//      is a MAIN-world + allFrames rejection on its ad-iframe-heavy page.
+import { describe, it } from './runner.mjs';
+import { JSDOM } from 'jsdom';
+import * as fs from 'fs';
+import * as path from 'path';
+import { fileURLToPath } from 'url';
+
+const __dirname = path.dirname(fileURLToPath(import.meta.url));
+const indexSource = fs.readFileSync(
+  path.join(__dirname, '../src/viewer/index.js'),
+   'utf-8'
+);
+
+// Extract a `function <name>(...) {…}` by balanced-brace scan. Robust to the
+// file's quirky/mixed indentation (a column-0 `}` heuristic would mis-truncate
+// nested or oddly-indented bodies).
+function extractFn(src, name) {
+  const re = new RegExp('function ' + name + '\\s*\\(');
+  const m = re.exec(src);
+  if (!m) throw new Error('not found: ' + name);
+  const start = m.index;
+  let i = src.indexOf('{', start), depth = 0;
+  for (; i < src.length; i++) {
+    const c = src[i];
+    if (c === '{') depth++;
+    else if (c === '}') { depth--; if (depth === 0) return src.slice(start, i + 1); }
+   }
+  throw new Error('unbalanced: ' + name);
+}
+
+// The direct-media URL, shaped exactly like the rejected case (a trailing slash +
+// ?rnd= query). This is the concrete case the predicate used to reject.
+const DIRECT_MP4 =
+  'https://example.com/get_file/5/6cae22f8b3ba9d74f10cc2f8d060af738c8d30ddf5/14644000/14644093/14644093.mp4/?rnd=1787811205406';
+
+describe('HLS QA: simple <video> direct-media predicate', () => {
+  // Extract and evaluate the REAL isValidManifestUrl from index.js in a browser
+  // window so its `new URL(...)` / string behavior matches production.
+  const isValidSrc = extractFn(indexSource, 'isValidManifestUrl');
+
+  function assertValid(url, expectValid, label) {
+    const dom = new JSDOM(
+      '<!DOCTYPE html><html><body></body></html>',
+       { url: 'https://example.com/videos/x/', runScripts: 'dangerously' }
+     );
+    const got = dom.window.eval('(' + isValidSrc + ')(' + JSON.stringify(url) + ')');
+    if (got !== expectValid) {
+      throw new Error(
+        `${label || 'isValidManifestUrl'}(${url}) = ${got}, expected ${expectValid}`
+       );
+    }
+  }
+
+  it('accepts a real direct-MP4 URL WITH a trailing slash + ?rnd=', () => {
+    // Before the fix, `path.endsWith('/')` rejected this real media source.
+    assertValid(DIRECT_MP4, true, 'trailing-slash MP4');
+   });
+
+  it('accepts a direct .mp4 with no trailing slash', () => {
+    assertValid('https://cdn.example.com/vids/abc123.mp4', true, 'plain MP4');
+   });
+
+  it('accepts real .m3u8 / .webm / .mpd / .m4s / /hls/ media signals', () => {
+    assertValid('https://cdn.example.com/live/master.m3u8', true, 'master.m3u8');
+    assertValid('https://cdn.example.com/seg/webm/v.webm', true, 'webm');
+    assertValid('https://cdn.example.com/seg/dash/master.mpd', true, 'mpd');
+    assertValid('https://cdn.example.com/seg/1-0.m4s', true, 'm4s');
+    assertValid('https://cdn.example.com/hls/abc/playlist.m3u8', true, '/hls/');
+   });
+
+  it('does not over-reject a real .m3u8 carrying a valid %2B/%2F token', () => {
+     // %2B/%2F are valid percent-encoded hex pairs — a genuine auth token, not a
+    // route-template placeholder, so it must survive.
+    assertValid('https://cdn.example.com/live/master.m3u8?h=a%2Bb%2Fc&e=1234', true, '%2B token');
+   });
+
+  it('still rejects route-template / nav URLs (no over-acceptance)', () => {
+     // The fix must not trade one regression for the other: the route templates
+    // a provider's pageContext.langUrls leaks must still be rejected.
+    assertValid('https://example.com/playlists/', false, '/playlists/');
+    assertValid('https://example.com/playlists/liked/', false, '/playlists/liked/');
+    assertValid('https://example.com/playlist/%1%/video/%2%/', false, '/playlist/%1%/');
+    assertValid('https://example.com/members/%ID%/playlists/', false, '/members/%ID%/playlists/');
+    assertValid('https://example.com/videos/%DIR%/', false, '/videos/%DIR%/');
+   });
+});
+
+describe('HLS QA: scrapeTab isolated-world fallback', () => {
+  // Extract the whole scrapeTab function (balanced braces, indentation-agnostic).
+  const scrapeSrc = extractFn(indexSource, 'scrapeTab');
+
+  it('runs an isolated-world scrape attempt (no `world` key) as a fallback', () => {
+    const calls = scrapeSrc.match(/executeScript\(\s*\{[\s\S]*?\}\s*\)/g) || [];
+    if (calls.length === 0) {
+      throw new Error('scrapeTab has no executeScript call');
+     }
+     // At least one executeScript must omit `world` so it runs in the always-
+    // permitted isolated world (recovers simple videos a MAIN-world injection
+    // rejects on sandboxed/opaque-origin ad iframes).
+    const hasIsolated = calls.some((c) => !/\bworld\s*:/.test(c));
+    if (!hasIsolated) {
+      throw new Error(
+        'scrapeTab has no isolated-world (no `world:`) executeScript fallback — ' +
+         'a MAIN-world+allFrames rejection on an ad-iframe-heavy page leaves 0 videos'
+       );
+    }
+   });
+
+  it('primary scrape still uses world: \'MAIN\' (reads page globals)', () => {
+    const calls = scrapeSrc.match(/executeScript\(\s*\{[\s\S]*?\}\s*\)/g) || [];
+    const hasMain = calls.some((c) => /world\s*:\s*['"]MAIN['"]/.test(c));
+    if (!hasMain) {
+      throw new Error(
+        'scrapeTab primary attempt must use world: "MAIN" to read page globals ' +
+         '(interceptor data, Hls instances, custom <video> props)'
+       );
+    }
+   });
+});

__tests__/viewer_integration.test.mjs

@@ -62,7 +62,7 @@ function createBrowserEnv({ storageData = {}, url = 'https://example.com/viewer/
   // 'native' mode sets HLS = undefined so viewer.js takes the Safari native path.
   const hlsCalls = { instances: [], loaded: false };
   if (hlsMode === 'mocked') {
-    win.HLS = class MockHLS {
+    win.Hls = class MockHLS {
       constructor(opts) {
         hlsCalls.instances.push({ opts, destroyed: false, events: {}, source: null, media: null });
       }
@@ -103,7 +103,7 @@ function createBrowserEnv({ storageData = {}, url = 'https://example.com/viewer/
   } else if (hlsMode === 'native') {
     // Simulate Safari — window.HLS exists but isSupported() returns false.
     // viewer.js then falls through to video.src = manifestUrl (native HLS).
-    win.HLS = class MockHLS_Native {
+    win.Hls = class MockHLS_Native {
       static isSupported() {
         return false; // Safari has native HLS, Hls.js is not needed
       }
@@ -178,15 +178,6 @@ describe('Integration: viewer.js with HLS entries', () => {
             return;
           }
 
-          // HLS detection in console logs
-          const hlsLogs = consoleLogs.filter(
-            (l) => l.includes('HLS detected') || l.includes('HLS')
-          );
-          if (hlsLogs.length === 0) {
-            reject(new Error(`No HLS detection in logs. Logs: ${consoleLogs.join(' | ')}`));
-            return;
-          }
-
           // Verify Hls.js was actually instantiated for the HLS entry
           if (hlsCalls.instances.length < 1) {
             reject(new Error('Expected at least 1 HLS instance, got 0'));
@@ -391,15 +382,6 @@ describe('Integration: viewer.js with HLS entries', () => {
             return;
           }
 
-          // HLS detection in logs
-          const hlsLogs = consoleLogs.filter(
-            (l) => l.includes('HLS detected') || l.includes('HLS')
-          );
-          if (hlsLogs.length === 0) {
-            reject(new Error(`No HLS logs. All: ${consoleLogs.join(' | ')}`));
-            return;
-          }
-
           // Only one HLS instance (for the HLS entry)
           if (hlsCalls.instances.length !== 1) {
             reject(new Error(`Expected 1 HLS instance, got ${hlsCalls.instances.length}`));

docs/instructions-audit.md

@@ -0,0 +1,25 @@
+# Instructions UI audit
+
+## Scope
+This audit covers the VidPlex popup instructions banner added in `src/viewer/index.html`, `src/viewer/index.css`, and `src/viewer/index.js`.
+
+## What the UI now explains
+- How to scan the current page for videos
+- How to review clickable results
+- How to open the 2x2 viewer
+- How to clear and rescan
+- A caveat that browser pages, extension pages, and restricted frames may hide videos
+
+## Accessibility checks
+- The instructions section uses `role="region"` and an accessible label
+- The collapse toggle is wired with `aria-expanded` and `aria-controls`
+- The body is hidden with the `hidden` attribute when collapsed
+
+## UX notes
+- The panel is visible on mount so first-time users see the steps immediately
+- The toggle label changes between “Hide instructions” and “Show instructions”
+- The copy intentionally stays short so the popup remains readable in a narrow extension window
+
+## Validation
+- Covered by `__tests__/instructions_ui.test.mjs`
+- Verified alongside the existing build/test flow in the parent implementation task

docs/instructions-copy.md

@@ -0,0 +1,17 @@
+# Instructions UI copy
+
+## Banner copy
+Quick start
+How to use VidPlex
+
+## Steps
+1. Scan videos — Click Find Videos to search the current browser window for videos.
+2. Review the list — Check the popup list; each found video URL is clickable.
+3. Open the viewer — Click Open Viewer to open the 2x2 grid player in a new window.
+4. Reset and rescan — Click Clear to erase results and scan again.
+
+## Warning copy
+Warning: Browser pages, extension pages, and restricted frames can hide videos, so results may be incomplete.
+
+## Learn-more copy
+Learn more tooltip: Read the VidPlex README and audit notes.

docs/instructions-demo.svg

@@ -0,0 +1,50 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="1280" height="720" viewBox="0 0 1280 720" role="img" aria-label="VidPlex popup instructions preview">
+  <defs>
+    <style>
+      .bg { fill: #ffffff; }
+      .panel { fill: #f8fafc; stroke: #e2e8f0; stroke-width: 1; }
+      .text { fill: #1a1a2e; font-family: -apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif; }
+      .muted { fill: #64748b; }
+      .accent { fill: #4361ee; }
+      .warn { fill: #7c3aed; }
+      .small { font-size: 12px; }
+      .tiny { font-size: 11px; letter-spacing: .08em; font-weight: 700; }
+      .title { font-size: 18px; font-weight: 600; }
+      .h2 { font-size: 14px; font-weight: 600; }
+      .step-title { font-size: 12px; font-weight: 600; }
+      .body { font-size: 12px; fill: #475569; }
+      .button-text { font-size: 12px; fill: #4361ee; }
+      .primary-text { fill: #ffffff; font-size: 14px; }
+    </style>
+  </defs>
+
+  <rect class="bg" x="0" y="0" width="1280" height="720"/>
+  <text class="text title" x="18" y="30">VidPlex</text>
+
+  <rect class="panel" x="17" y="50" width="1264" height="276" rx="10"/>
+  <text class="text muted tiny" x="30" y="72">QUICK START</text>
+  <text class="text h2" x="30" y="90">How to use VidPlex</text>
+
+  <rect x="1150" y="62" width="104" height="28" rx="8" fill="#ffffff" stroke="#e2e8f0"/>
+  <text class="button-text" x="1165" y="80">Hide instructions</text>
+
+  <g class="text">
+    <text class="step-title" x="48" y="126">Scan videos</text>
+    <text class="body" x="48" y="144">Click Find Videos to search the current browser window for videos.</text>
+
+    <text class="step-title" x="48" y="176">Review the list</text>
+    <text class="body" x="48" y="194">Check the popup list; each found video URL is clickable.</text>
+
+    <text class="step-title" x="48" y="226">Open the viewer</text>
+    <text class="body" x="48" y="244">Click Open Viewer to open the 2x2 grid player in a new window.</text>
+
+    <text class="step-title" x="48" y="276">Reset and rescan</text>
+    <text class="body" x="48" y="294">Click Clear to erase results and scan again.</text>
+
+    <text class="warn small" x="30" y="319">Warning: Browser pages, extension pages, and restricted frames can hide videos, so results may be incomplete.</text>
+    <text class="body" x="30" y="348">Learn more tooltip: Read the VidPlex README and audit notes.</text>
+  </g>
+
+  <rect x="17" y="339" width="1264" height="31" rx="8" fill="#4361ee"/>
+  <text class="primary-text" x="561" y="359">Find Videos (all tabs)</text>
+</svg>

docs/instructions-design.md

@@ -0,0 +1,26 @@
+# Instructions UI design
+
+## Placement
+The instructions banner sits above the primary action button so new users can read the steps before interacting with the popup.
+
+## Structure
+- Short kicker: “Quick start”
+- Heading: “How to use VidPlex”
+- Expand/collapse toggle for users who want a smaller popup
+- Ordered list of the core tasks
+- One warning line for edge cases
+- One short learn-more line that points to the README and audit notes
+
+## Copy strategy
+The microcopy avoids jargon and keeps each step tied to a visible control:
+- Find Videos
+- Open Viewer
+- Clear
+
+## Accessibility strategy
+- A labelled region exposes the whole panel to assistive tech
+- The toggle reflects the current visibility state
+- The collapsed state removes the body from the layout entirely
+
+## Notes
+This design intentionally favors clarity over density because extension popups are small and users typically need the instructions only once.

docs/pr-description.md

@@ -0,0 +1,42 @@
+# Add user instructions to goon plugin UI
+
+Branch: `feature/goon-instructions`
+
+## Summary
+Adds an always-visible, collapsible quick-start panel to the VidPlex popup so users can understand the scan / review / open / clear flow without reading the README first.
+
+## Links
+- Audit notes: [docs/instructions-audit.md](docs/instructions-audit.md)
+- Design notes: [docs/instructions-design.md](docs/instructions-design.md)
+- Copy deck: [docs/instructions-copy.md](docs/instructions-copy.md)
+- Preview render: [docs/instructions-demo.svg](docs/instructions-demo.svg)
+
+## Testing
+- `npm run build`
+- `npm test`
+
+Manual verification:
+1. Open the extension popup.
+2. Confirm the instructions banner renders expanded on mount.
+3. Click the toggle and confirm the panel collapses / expands and the label changes.
+4. Confirm the main Scan Videos button still works normally.
+
+## Changed files
+- `src/viewer/index.html`
+- `src/viewer/index.css`
+- `src/viewer/index.js`
+- `__tests__/instructions_ui.test.mjs`
+- `__tests__/run.mjs`
+- `docs/instructions-audit.md`
+- `docs/instructions-design.md`
+- `docs/instructions-copy.md`
+- `docs/instructions-demo.svg`
+
+## Acceptance criteria
+- A PR exists against `master`.
+- The PR description includes summary, links to the design/copy docs, a visual preview, testing steps, changed files, and acceptance criteria.
+- Reviewers are requested before handoff.
+
+## Open questions / risks
+- The repo still has some pre-existing lint warnings outside this change.
+- The preview asset is an SVG render of the UI rather than a raster screenshot.

eslint.config.js

@@ -0,0 +1,24 @@
+// ESLint flat config — v9+
+import globals from 'globals';
+
+export default [
+  {
+    ignores: ['dist/', 'node_modules/', '__tests__/'],
+  },
+  {
+    files: ['**/*.js', '**/*.mjs'],
+    languageOptions: {
+      ecmaVersion: 2024,
+      sourceType: 'module',
+      globals: {
+        ...globals.browser,
+        ...globals.es2024,
+        chrome: 'readonly',
+      },
+    },
+    rules: {
+      'no-unused-vars': ['warn', { argsIgnorePattern: '^_' }],
+      'no-console': 'off',
+    },
+  },
+];

manifest.json

@@ -1,12 +1,14 @@
 {
   "manifest_version": 3,
-  "name": "Goon Plugin",
-  "version": "0.1.0",
-  "description": "A Chrome extension",
+  "name": "VidPlex",
+   "version": "0.1.1",
+  "description": "Find videos on any page and view them in a grid.",
       "permissions": [
           "storage",
           "tabs",
-    "scripting"
+          "scripting",
+            "webRequest",
+            "declarativeNetRequest"
        ],
   "host_permissions": [
     "<all_urls>"
@@ -31,6 +33,12 @@
       "all_frames": true
     }
   ],
+  "web_accessible_resources": [
+    {
+      "resources": ["interceptors.js", "hlds.js"],
+      "matches": ["<all_urls>"]
+    }
+  ],
   "icons": {
     "16": "icons/icon16.png",
     "48": "icons/icon48.png",

package-lock.json

@@ -1,15 +1,12 @@
 {
-  "name": "goon-plugin",
+  "name": "vidplex",
   "version": "0.1.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
-      "name": "goon-plugin",
+      "name": "vidplex",
       "version": "0.1.0",
-      "dependencies": {
-        "hls.js": "^1.5.17"
-      },
       "devDependencies": {
         "ajv": "^8.17.1",
         "ajv-formats": "^3.0.1",
@@ -2784,12 +2781,6 @@
         "node": ">= 0.4"
       }
     },
-    "node_modules/hls.js": {
-      "version": "1.6.17",
-      "resolved": "https://registry.npmjs.org/hls.js/-/hls.js-1.6.17.tgz",
-      "integrity": "sha512-NUplVGVuc1hSPwdB/9/cbRkUmLrYi75/hqiXKdA+l300pJNxDu96R7jRb2imDzWJqIUF4I5ThmAdp9GvOCXsuQ==",
-      "license": "Apache-2.0"
-    },
     "node_modules/html-encoding-sniffer": {
       "version": "4.0.0",
       "resolved": "https://registry.npmjs.org/html-encoding-sniffer/-/html-encoding-sniffer-4.0.0.tgz",

package.json

@@ -1,21 +1,18 @@
 {
-  "name": "goon-plugin",
-  "version": "0.1.0",
+  "name": "vidplex",
+   "version": "0.1.1",
   "private": true,
-  "description": "Chrome extension scaffold",
+  "description": "Chrome extension: find videos on a page and view them in a grid.",
   "type": "module",
   "scripts": {
     "dev": "vite",
-    "build": "vite build",
+    "build": "vite build && node scripts/copy-hlds.mjs",
     "lint": "eslint .",
     "lint:fix": "eslint . --fix",
     "test": "node __tests__/run.mjs",
     "test:watch": "vitest",
     "check": "tsc --noEmit"
   },
-  "dependencies": {
-    "hls.js": "^1.5.17"
-  },
   "devDependencies": {
     "ajv": "^8.17.1",
     "ajv-formats": "^3.0.1",
@@ -26,5 +23,7 @@
     "typescript": "^5.7.0",
     "vite": "^6.0.0",
     "vitest": "^3.0.0"
+  },
+  "dependencies": {
   }
 }

scripts/copy-hlds.mjs

@@ -0,0 +1,20 @@
+// Copy the original ES5 hls.min.js source directly to dist/hlds.js.
+// This avoids Vite/esbuild adding arrow functions (which Chrome flags as "ES module content"
+// in extension URLs, preventing window.Hls from registering).
+
+import { readFileSync, writeFileSync } from 'fs';
+import { fileURLToPath } from 'url';
+import { dirname, resolve } from 'path';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = dirname(__filename);
+
+const src = resolve(__dirname, '../src/inject/hls.min.js');
+const dst = resolve(__dirname, '../dist/hlds.js');
+let data = readFileSync(src, 'utf-8');
+
+// Remove sourceMappingURL line (avoids Chrome trying to fetch it from an invalid chrome-extension:// URL)
+data = data.replace(/[\r\n]+\/\/# sourceMappingURL=[^\s]*[\r\n]*/, '');
+
+writeFileSync(dst, data);
+console.log(`[copy-hlds] Copied hls.min.js -> dist/hlds.js (${data.length} bytes, pure ES5 source)`);

src/background/background.js

@@ -4,29 +4,617 @@
  * Uses Manifest V3 module-type service worker.
  */
 
-// Fired when the extension is first installed / updated / Chrome starts.
-chrome.runtime.onInstalled.addListener((details) => {
-  if (details.reason === 'install') {
-    console.log('[goon-plugin] Extension installed');
-  } else if (details.reason === 'update') {
-    console.log(`[goon-plugin] Extension updated from ${details.previousVersion}`);
+// === HLS manifest tracking via chrome.webRequest ===
+// Intercepts network requests at the browser level — no world/timing issues.
+// Catches .m3u8 manifest requests from ANY player (HLS.js, Video.js, custom).
+//
+// IMPORTANT: MV3 service workers are ephemeral — they are killed when idle and
+// restarted on demand. In-memory state (Map, Set, etc.) is LOST on kill.
+// Therefore, we persist captured manifests to chrome.storage.local so they
+// survive service worker restarts.
+
+function isHlsManifest(url) {
+  const u = url.toLowerCase();
+  // Exclude media segments
+  if (u.includes('.ts') || u.includes('.mp4') || u.includes('.webm') ||
+      u.includes('.aac') || u.includes('.m4s')) return false;
+  return u.includes('.m3u8') || u.includes('.hlsvod') ||
+         (u.includes('/hls/') && u.includes('.m3u')) ||
+         u.includes('/playlist.m3u') || u.includes('/manifest');
+}
+
+// === STRATEGY 8: Network-level fallback — log video requests across any CDN ===
+// Some players generate HLS manifests in-memory and make zero .m3u8 network
+// requests, only fetching video segments from a CDN. By logging every video-like
+// request (any host) we can: (a) confirm HLS activity via segment patterns,
+// (b) reconstruct manifest URLs from segment paths, (c) detect CDN response
+// headers that reveal playlist endpoints. No site-specific host list.
+const VIDEO_PATH_PATTERNS = ['/hls/', '/dash/', '/video/', '/segment', '/media/', '/stream'];
+
+function isVideoRequest(url) {
+  const u = url.toLowerCase();
+  // Already a known video/manifest extension
+  if (u.includes('.m3u8') || u.includes('.mpd') || u.includes('.hlsvod') ||
+      u.includes('.ts') || u.includes('.m4s') || u.includes('.mp4')) return true;
+  // Path-based detection for in-memory playlists
+  return VIDEO_PATH_PATTERNS.some(p => u.includes(p));
+}
+
+// Persist all video requests per tab (survives SW restarts)
+async function persistVideoRequest(tabId, url) {
+  const key = 'vr_requests_' + tabId;
+  try {
+    const stored = await chrome.storage.local.get(key);
+    const arr = stored[key] || [];
+    // Avoid duplicates — video segments come in rapid succession
+    if (!arr.some(r => r === url)) {
+      arr.push(url);
+      // Keep last 200 requests per tab (enough to detect segment patterns)
+      if (arr.length > 200) arr.splice(0, arr.length - 200);
+      await chrome.storage.local.set({ [key]: arr });
     }
-});
+  } catch(e) {
+    console.warn('[vidplex-bg] Failed to persist video request:', e && e.message ? e.message : e);
+  }
+}
+
+// --- Token / URL helpers ------------------------------------------
+//
+// A media CDN's auth token (h= / hash= / hdnea=) is base64 and its %-encoded
+// escapes are significant: a `+` decoded to a space corrupts it, which is what
+// produces the 410 Gone the live player avoids by sending `%2B`. So every
+// helper below keeps the query string RAW — it is never passed through
+// URLSearchParams (which decodes + -> space).
+
+// Group key for a video's URL: the path directory holding its variant/segment
+// (the last non-file path segment of a CDN URL). Used to match the freshest
+// live URL by video, host-independent. '' when the URL is malformed.
+function extractGroupKey(url) {
+  if (!url) return '';
+  try {
+    const path = new URL(url).pathname.split('/');
+    // Drop the final (file/segment or manifest) segment; the remaining
+    // directory joins into a key that is stable across a video's variants.
+    path.pop();
+    return path.join('/');
+  } catch {
+    return '';
+  }
+}
+
+// Raw query (everything after '?') with no decoding. '' when absent.
+function extractRawQuery(url) {
+  const idx = url.indexOf('?');
+  return idx === -1 ? '' : url.slice(idx + 1);
+}
+
+// Best-effort token expiry (epoch seconds) from a RAW query; 0 = unknown.
+// Used to rank tokens freshest-first so rescans pick the one most likely to
+// still validate.
+function tokenExpirySeconds(rawQuery) {
+  let secs = 0;
+  for (const key of ['validto', 'exp', 'e']) {
+    const m = new RegExp(key + '=(\\d+)').exec(rawQuery);
+    if (m) { secs = Math.max(secs, parseInt(m[1], 10)); break; }
+   }
+  return secs;
+}
+
+  // Build the parent manifest URL for a segment URL, keeping the FULL path to
+  // the variant directory and the RAW query (token encoding intact). Swaps the
+  // segment filename for a manifest filename in the same directory:
+  // {host}/path/to/variant/seg-1.ts   ->   {host}/path/to/variant/master.m3u8
+  // The variant directory is MANDATORY — a master playlist lives inside it;
+  // dropping it yields a 404/410. Returns '' for non-segment URLs.
+  function buildManifestForVariant(url) {
+  if (!url || !/\/seg-\d+/i.test(url)) return '';
+  try {
+    const [pathPart, queryPart] = url.split('?');
+    const idx = pathPart.lastIndexOf('/');
+    if (idx === -1) return '';
+    const dir = pathPart.slice(0, idx);            // variant directory
+    const rawQuery = queryPart ? '?' + queryPart : '';
+    return `${dir}/master.m3u8${rawQuery}`;
+       } catch {
+    return '';
+       }
+}
+
+// Reconstruct manifest URLs from segment URLs, keeping the raw query intact.
+// The live tab keeps rotating short-lived tokens; each captured segment's query
+// is the most recent token seen for that variant.
+function reconstructManifestsFromSegments(segments) {
+  const seen = new Set();
+  const manifests = [];
+  for (const url of segments) {
+        // Only handle video/segment URLs (e.g. .../seg-N.ts).
+    const manifestUrl = buildManifestForVariant(url);
+    if (manifestUrl && !seen.has(manifestUrl)) {
+      seen.add(manifestUrl);
+      manifests.push(manifestUrl);
+        }
+       }
+  return manifests;
+}
+
+// Collect captured video URLs across ALL tabs without a tabs.query match pattern
+// (which throws if the pattern is malformed). We scan every persisted vr_requests_ /
+// wr_manifests_ key so the rescan works even if the live source tab is closed.
+async function collectAllVideoUrls() {
+  const all = await chrome.storage.local.get();
+  const out = [];
+  for (const key of Object.keys(all)) {
+    if ((key.startsWith('vr_requests_') || key.startsWith('wr_manifests_')) && Array.isArray(all[key])) {
+      out.push(...all[key]);
+      }
+    }
+  return out;
+}
+
+  // For a group key, return the freshest live captured URL (highest token
+  // expiry) across all persisted tabs, preferring captured .m3u8 manifest URLs.
+  // null if nothing usable is captured yet. Rescans use this to replace a
+  // stored URL that now 410s with the newest token the live tab captured.
+  //
+  // No tabs.query match pattern is used: match patterns are brittle (a bad
+  // pattern throws "Invalid url pattern" and silently drops every rescan).
+  // We scan persisted capture data instead, which is always available and
+  // sidesteps the match-pattern API entirely.
+ async function freshLiveForGroup(groupKey, preferManifest) {
+  let all;
+  try {
+    all = await collectAllVideoUrls();
+     } catch (e) {
+    console.warn('[vidplex-bg] collectAllVideoUrls failed:', e && e.message ? e.message : e);
+    all = [];
+     }
+
+  let bestManifest = null, bestManifestExp = 0;
+  let bestVariant = null, bestVariantExp = 0;
+  let bestTokenSource = null, bestTokenExp = 0;
+  for (const url of all) {
+    if (extractGroupKey(url) !== groupKey) continue;
+    const exp = tokenExpirySeconds(extractRawQuery(url));
+    if (url.includes('.m3u8')) {
+      if (exp > bestManifestExp) { bestManifestExp = exp; bestManifest = url; }
+       } else if (/\/seg-\d+/i.test(url)) {
+      if (exp > bestVariantExp) { bestVariantExp = exp; bestVariant = url; }
+       } else {
+        if (exp > bestTokenExp) { bestTokenExp = exp; bestTokenSource = url; }
+       }
+      }
+
+     // Prefer a captured manifest; else the best segment (reconstructable to a
+     // manifest); else a token source so the proxy can re-token a good path.
+    if (bestManifest) return bestManifest;
+    if (!preferManifest && bestVariant) return bestVariant;
+    if (!preferManifest && bestTokenSource) return bestTokenSource;
+    if (bestVariant) return bestVariant;
+    return bestManifest || bestTokenSource || null;
+  }
+
+// Cache freshest tokens per group key so we don't query storage on every proxy
+// request. Keyed by group key; values resolve once and are reused until a rescan
+// (GOON_RESOLVE_MANIFEST) or a 410 forces an invalidation.
+const tokenCache = new Map();
+
+// Given a CDN URL that arrives WITHOUT a query (hls.js drops the relative-URL
+// token when building sub-playslists/segments), inject the freshest live token
+// for that group. Returns the URL with a query appended, or the original URL
+// unchanged when no token is available yet.
+async function injectFreshToken(url) {
+  if (!url) return url;
+  // Already carries a token — leave it alone.
+ if (url.includes('?')) return url;
+ try {
+    const groupKey = extractGroupKey(url);
+    if (!groupKey) return url;
+    if (tokenCache.has(groupKey)) {
+      const token = tokenCache.get(groupKey);
+      return token ? url + '?' + token : url;
+     }
+    const fresh = await freshLiveForGroup(groupKey, false);
+    const token = fresh ? extractRawQuery(fresh) : '';
+    tokenCache.set(groupKey, token);
+    console.log('[vidplex-bg] injectFreshToken for', groupKey, (token ? token.substring(0, 40) + '…' : '(none captured)'));
+    return token ? url + '?' + token : url;
+   } catch {
+    return url;
+     }
+}
+
+// Clear the per-video token cache. Called on rescan so the next proxy fetches
+// re-query storage for a freshly-rotated token.
+function invalidateTokenCache() { tokenCache.clear(); }
+
+// CDN registrable domains whose referer we have already captured this SW
+// lifetime, so we do not re-query the tab for every segment of a stream.
+// Lost if the SW is killed; persistReferer's storage dedupe covers a fresh SW.
+const refererCapturedDomains = new Set();
+
+chrome.webRequest.onBeforeRequest.addListener(
+  async (details) => {
+    if (details.tabId < 0) return;
+
+    // Log video-like requests from any host (CDN-agnostic).
+    if (isVideoRequest(details.url)) {
+      console.log('[vidplex-bg] webRequest: video request in tab', details.tabId, ':', details.url.substring(0, 180));
+      await persistVideoRequest(details.tabId, details.url);
+       // Capture the provider referer for this CDN host from the source tab's
+       // URL: the browser sends the referring page's URL as the Referer for a
+       // cross-origin video request, and that IS the tab's URL. extraInfoSpec
+       // (reading the actual request headers) is rejected by some Chromium
+       // builds and fails the whole service worker, so we derive the referer
+       // from the tab instead. The `tabs` + host_permissions already allow it.
+      const host = hostOf(details.url);
+      const domain = host ? registrableDomain(host) : '';
+      if (domain && !refererCapturedDomains.has(domain)) {
+        try {
+          const tab = await chrome.tabs.get(details.tabId);
+          const ref = tab && tab.url;
+          if (ref) {
+            await persistReferer(host, ref);
+            refererCapturedDomains.add(domain);
+            console.log('[vidplex-bg] captured referer for', domain, '->', ref);
+          }
+        } catch {
+          // Tab may have closed mid-stream; a later request from a live tab
+          // re-captures. Best-effort.
+        }
+      }
+      }
+
+      // Also capture HLS manifest URLs (original logic)
+     if (!isHlsManifest(details.url)) return;
+
+    console.log('[vidplex-bg] webRequest: HLS manifest in tab', details.tabId, ':', details.url.substring(0, 120));
+
+    const key = 'wr_manifests_' + details.tabId;
+    try {
+      const stored = await chrome.storage.local.get(key);
+      const arr = stored[key] || [];
+      if (!arr.includes(details.url)) {
+        arr.push(details.url);
+        await chrome.storage.local.set({ [key]: arr });
+      }
+    } catch(e) {
+      console.warn('[vidplex-bg] Failed to persist webRequest manifest:', e && e.message ? e.message : e);
+    }
+  },
+  { urls: ['<all_urls>'] }
+);
+
+// Clean up stale PER-TAB entries when tabs are closed. NOTE: 'goon_referers' is
+// a domain-keyed GLOBAL store — it must outlive its capture tab so a proxy fetch
+// for that host still finds its referer after the source tab is closed. It is
+// therefore NOT removed here (only the per-tab vr_requests_/wr_manifests_ keys
+// are). Stale referers are pruned opportunistically in persistReferer.
+chrome.tabs.onRemoved.addListener(async (tabId) => {
+  const keys = ['wr_manifests_' + tabId, 'vr_requests_' + tabId];
+  try {
+    await chrome.storage.local.remove(keys);
+     } catch { /* ignore */ }
+    });
+
+// === Capture the provider-origin Referer per CDN host (CDN-agnostic) ===
+// Some media CDNs reject requests whose `Referer` is not the provider page's
+// origin (HTTP 412). A fetch() CANNOT set `Referer` — it is a "forbidden
+// header" in the Fetch API, so a service-worker fetch() would send
+// `Referer: chrome-extension://<id>`, which the CDN rejects. The
+// declarativeNetRequest API rewrites request headers at the network layer, below
+// the Fetch API's restriction, and its rules apply to fetch() calls made inside
+// the SW.
+//
+// We cannot hardcode a target referer: the proxy is invoked from the viewer
+// (a different origin than the source page), and a DNR rule cannot read a live
+// page's origin. So we derive the provider referer from the source tab's own URL.
+// For a cross-origin video request the browser sends the referring page's URL as
+// the Referer, and that page IS the tab currently loading the video — so the tab
+// URL is the referer we need. We read it via chrome.webRequest.onBeforeRequest
+// (no header access — it cannot read the request headers) plus chrome.tabs.get,
+// which returns the source tab's URL, and persist that per CDN host. The
+// GOON_PROXY_FETCH handler then installs a DNR rule that re-inserts that
+// captured referer for just that host, so the proxy's fetch() is accepted.
+// This requires no knowledge of any particular site. Deriving the referer from
+// the tab URL (rather than reading the real request header via
+// onBeforeSendHeaders + extraHeaders) is intentional: extraInfoSpec header
+// parsing is rejected by some Chromium builds and fails the whole service worker,
+// and the tabs + host permissions already permit chrome.tabs.get.
+//
+// Each CDN host gets its OWN declarativeNetRequest rule id so that concurrent
+// proxy fetches for different hosts can't clobber each other's rule (a single
+// shared id + a remove-then-add lets two hosts interleave and leave the wrong
+// host's referer live). The id is derived from the host via a monotonic counter
+// keyed by host, so it is stable for a given host across installs.
+let nextRefererRuleId = 9001;
+const refererRuleIds = new Map();
+function refererRuleIdFor(host) {
+  const existing = refererRuleIds.get(host);
+  if (existing !== undefined) return existing;
+  const id = nextRefererRuleId++;
+  refererRuleIds.set(host, id);
+  return id;
+}
+
+// host of a URL (CDN host, lowercased); '' when the URL is malformed.
+function hostOf(url) {
+  if (!url) return '';
+  try { return new URL(url).host.toLowerCase(); } catch { return ''; }
+}
+
+// Registrable domain of a CDN host — the label a single provider's referer
+// applies to. A referer-protecting CDN serves manifests and segments from many
+// edge subdomains that share ONE
+// provider referer, so we key the referer store, the DNR rule, and proxy-host
+// matching on this domain rather than the exact subhost.
+//
+// Heuristic: the last two DNS labels. Correct for the overwhelmingly common
+// single-label public suffixes (.com, .net, .org, .io, ...). Known caveat:
+// multi-label public suffixes such as .co.uk / .com.au collapse to the public
+// suffix itself (foo.co.uk -> co.uk); that is an exotic edge case and no worse
+// than the exact-host behavior it replaces. A single-level host (no dot, or a
+// bare TLD) is returned unchanged.
+function registrableDomain(host) {
+  if (!host) return '';
+  const parts = host.split('.');
+  if (parts.length < 2) return host;
+  return parts.slice(-2).join('.');
+}
+
+
+// How long a captured referer is trusted before it is pruned on the next
+// persist. Kept long enough for the scan-now / watch-later flow (a user scans a
+// page, then opens the viewer much later) without tying cleanup to tab close (a
+// still-open source tab's referer must survive other tabs closing).
+const REFERER_TTL_MS = 7 * 24 * 60 * 60 * 1000;
+
+// Persist the captured referer per CDN registrable domain so the proxy can
+// re-use it even after the capture tab closes. Keyed by the host's registrable
+// domain so a single provider referer covers every edge subdomain (a CDN serves
+// manifests/segments from many subhosts that share one referer), and so a proxy
+// for any sibling subhost can look it up without knowing the source tab. Each
+// entry is stamped with a capture time; entries older than the TTL are pruned
+// opportunistically here (never on tab close).
+async function persistReferer(host, referer) {
+  const domain = registrableDomain(host);
+  if (!domain || !referer) return;
+  try {
+    const stored = await chrome.storage.local.get('goon_referers');
+    const map = stored['goon_referers'] || {};
+    const now = Date.now();
+    // Opportunistic per-domain prune: drop entries older than the TTL.
+    for (const [h, entry] of Object.entries(map)) {
+      if (h !== domain && (!entry || !entry.at || now - entry.at > REFERER_TTL_MS)) {
+        delete map[h];
+      }
+    }
+    const current = map[domain];
+    if (current && current.referer === referer) return;
+    map[domain] = { referer, at: now };
+    await chrome.storage.local.set({ goon_referers: map });
+      } catch (e) {
+    console.warn('[vidplex-bg] persistReferer failed:', e && e.message ? e.message : e);
+     }
+ }
+
+// Look up the referer captured for a host's registrable domain. '' when none
+// has been captured (or the stored entry is malformed).
+async function getReferer(host) {
+  if (!host) return '';
+  try {
+    const stored = await chrome.storage.local.get('goon_referers');
+    const entry = (stored['goon_referers'] || {})[registrableDomain(host)];
+    return entry && entry.referer ? entry.referer : '';
+      } catch {
+    return '';
+      }
+ }
+
+// Install (idempotently) a DNR rule that sets the captured referer for a given
+// CDN host. The value comes from capture (or a fallback origin), never a
+// hardcoded site. Scoped to the requested host so only proxy fetches for that
+// host get the rewritten header.
+//
+// Each host gets its own rule id (refererRuleIdFor) so that concurrent proxy
+// fetches for DIFFERENT hosts never interleave: host A's rule and host B's rule
+// are distinct DNR ids and one install can't remove the other. Within a single
+// host, a per-host async lock (refererRuleLocks) serializes the idempotency
+// check + updateSessionRules so the install-and-record pair is atomic — no two
+// installs for the same host can interleave their check/update.
+const refererRuleInstalled = new Map();
+const refererRuleLocks = new Map();
+
+async function ensureRefererRule(host, referer) {
+  const domain = registrableDomain(host);
+  if (!domain || !referer) return;
+  const api = chrome.declarativeNetRequest;
+  if (!api || typeof api.updateSessionRules !== 'function') {
+    console.warn('[vidplex-bg] declarativeNetRequest unavailable; skipping referer rule');
+    return;
+  }
+
+   // Serialize per host so the idempotency check + updateSessionRules is atomic.
+  const run = (async () => {
+    if (refererRuleInstalled.has(domain) && refererRuleInstalled.get(domain) === referer) {
+      return;
+    }
+    const ruleId = refererRuleIdFor(domain);
+    try {
+      // Remove only THIS host's own rule id, then add it back scoped to the host.
+      await api.updateSessionRules({
+        removeRuleIds: [ruleId],
+        addRules: [{
+          id: ruleId,
+          priority: 1,
+          action: {
+            type: 'modifyHeaders',
+            // `set` is allowed for any request header (only `append` is restricted
+            // to a fixed allowlist). `referer` is the header the CDN checks.
+            requestHeaders: [
+              { header: 'referer', operation: 'set', value: referer },
+            ],
+          },
+          condition: {
+            // Host + subdomains ONLY, so only proxy fetches for this host get the
+            // rewritten referer; the source page's own requests keep theirs.
+            requestDomains: [domain],
+          },
+        }],
+      });
+      refererRuleInstalled.set(domain, referer);
+      console.log('[vidplex-bg] DNR referer rule installed for', domain, '(' + ruleId + ')');
+    } catch (e) {
+      console.warn('[vidplex-bg] ensureRefererRule failed:', e && e.message ? e.message : e);
+    }
+  })().finally(() => { refererRuleLocks.set(domain, null); });
+  refererRuleLocks.set(domain, run);
+  return run;
+}
+
+
+// === Message handlers for popup/data consumers ===
 
-// Listen for messages from popup or content scripts.
 chrome.runtime.onMessage.addListener((message, _sender, sendResponse) => {
-  console.log('[goon-plugin] Received:', message);
-
   switch (message.type) {
     case 'PING':
       sendResponse({ pong: true, timestamp: Date.now() });
-      break;
+      return;
 
-    default:
-      console.warn('[goon-plugin] Unknown message type:', message.type);
-      sendResponse({ error: `Unknown type: ${message.type}` });
-      break;
+    case 'GOON_GET_WEBREQUEST_MANIFESTS': {
+      (async () => {
+        const tabId = message.tabId;
+        const key = 'wr_manifests_' + tabId;
+        try {
+          const stored = await chrome.storage.local.get(key);
+          sendResponse({ manifests: stored[key] || [] });
+        } catch(e) {
+          sendResponse({ manifests: [] });
+        }
+      })();
+      return true;
     }
 
-  return true; // keep sendResponse channel open for async work
+     case 'GOON_GET_VIDEO_REQUESTS': {
+        // Strategy 8: Return all video requests for a tab, including reconstructed manifests
+        (async () => {
+         const tabId = message.tabId;
+         const [segKey] = ['vr_requests_' + tabId];
+        try {
+          const stored = await chrome.storage.local.get(segKey);
+          const segments = stored[segKey] || [];
+          // Also reconstruct manifest URLs from segment patterns
+          const reconstructed = reconstructManifestsFromSegments(segments);
+          sendResponse({
+            segments: segments,
+            reconstructedManifests: reconstructed,
+            totalRequests: segments.length,
+          });
+        } catch(e) {
+          sendResponse({ segments: [], reconstructedManifests: [], totalRequests: 0 });
+        }
+        })();
+      return true;
+      }
+
+      case 'GOON_RESOLVE_MANIFEST': {
+           // Resolve the freshest live manifest for the video encoded in a stored
+           // URL. The viewer calls this at startup and on a fatal network error:
+           // the live tab keeps rotating short-lived tokens, so the freshest
+           // captured manifest (highest expiry) replaces one that has 410'd.
+           // Clears the token cache first so subsequent proxy fetches re-query for
+           // the freshly-rotated token rather than the cached (now-dead) one.
+         async function resolveFreshManifest(message, sendResponse) {
+           invalidateTokenCache();
+           const url = message.url || '';
+           const groupKey = extractGroupKey(url);
+           if (!groupKey) { sendResponse({ ok: false, error: 'no group key' }); return; }
+           try {
+             const fresh = await freshLiveForGroup(groupKey, true);
+             sendResponse({ ok: true, fresh, groupKey, changed: !!(fresh && fresh !== url) });
+            } catch (e) {
+             console.warn('[vidplex-bg] resolveFreshManifest failed:', e && e.message ? e.message : e);
+             sendResponse({ ok: false, error: e && e.message ? e.message : String(e), groupKey });
+            }
+          }
+         resolveFreshManifest(message, sendResponse);
+         return true;
+        }
+
+       case 'GOON_PROXY_FETCH': {
+            // Proxy a fetch request through the service worker (bypasses CORS).
+            // Returns base64-encoded response data. Used by the viewer when
+            // extension-origin requests to video CDNs are blocked by CORS.
+            //
+            // A fetch() can't set the Referer itself (forbidden header — Chrome
+            // replaces it with chrome-extension://...), so a declarativeNetRequest
+            // rule installs the captured provider-origin referer at the network
+            // layer (DNR applies to SW fetch() per Chrome docs). The rule is
+            // installed on demand for the requested host only.
+           (async () => {
+             try {
+                const proxyHost = hostOf(message.url);
+                if (proxyHost) {
+                   // Prefer the provider's real referer captured from the live
+                   // tab (domain-aware), or the entry's scan-time referer the viewer sent.
+                    // With neither, install no rule: a self-origin referer is
+                    // guaranteed-wrong for hotlink protection, so we never fall
+                    // back to one (it would just 412).
+                   const captured = await getReferer(proxyHost);
+                   const referer = captured || message.referer || '';
+                   if (referer) await ensureRefererRule(proxyHost, referer);
+                   }
+                      // hls.js resolves sub-playslists/segments relative to the master
+                      // and can DROP the token query, handing us a token-less
+                      // URL that 410s. injectFreshToken supplies the freshest live
+                      // token for that video; the final `+` -> `%2B` pass keeps the
+                      // (possibly injected or surviving) base64 token intact for the
+                      // CDN's query parsing.
+               const resolved = await injectFreshToken(message.url || '');
+               const proxyUrl = resolved.replace(/\+/g, '%2B');
+               const resp = await fetch(proxyUrl);
+              if (!resp.ok) {
+                console.warn('[vidplex-bg] proxyFetch', resp.status, message.url.substring(0, 120));
+                sendResponse({ ok: false, status: resp.status, error: 'HTTP ' + resp.status });
+                return;
+                   }
+               const buffer = await resp.arrayBuffer();
+               const bytes = new Uint8Array(buffer);
+                     // Convert to base64 (btoa can only handle strings up to ~65k chars)
+                let binary = '';
+                const CHUNK_SIZE = 32768;
+                for (let i = 0; i < bytes.length; i += CHUNK_SIZE) {
+                 const chunk = bytes.subarray(i, i + CHUNK_SIZE);
+                 binary += String.fromCharCode.apply(null, Array.from(chunk));
+                   }
+               const base64 = btoa(binary);
+                sendResponse({ ok: true, data: base64, mimeType: resp.headers.get('content-type') || '' });
+              } catch(e) {
+              console.warn('[vidplex-bg] proxyFetch failed:', e && e.message ? e.message : e);
+              sendResponse({ ok: false, error: e && e.message ? e.message : String(e) });
+              }
+           })();
+         return true;
+         }
+
+    case 'GOON_GET_REFERERS': {
+        // Resolve the provider referer captured for each manifest host
+        // (domain-aware: one provider referer covers every edge subdomain).
+        // Used at scan time to bind the referer to a stored video entry so it
+        // survives the watch-later flow.
+       async function getReferers(message, sendResponse) {
+         const hosts = Array.isArray(message.hosts) ? message.hosts : [];
+         const referers = {};
+         for (const host of hosts) {
+           const r = await getReferer(host);
+           if (r) referers[host] = r;
+            }
+         sendResponse({ ok: true, referers });
+        }
+       getReferers(message, sendResponse);
+       return true;
+        }
+
+    default:
+      console.warn('[vidplex-plugin] Unknown message type:', message.type);
+  }
 });

src/content/content.js

@@ -24,128 +24,32 @@
 
   /**
    * Inject interceptors into the MAIN world at document_start.
-   * Runs BEFORE any page JS, so we catch all HLS activity.
+   *
+     * Uses script.src = chrome.runtime.getURL('interceptors.js') instead of
+     * script.textContent to bypass strict page CSP. Some sites enforce
+     * 'script-src' that blocks inline execution (textContent). Chrome treats
+     * extension-originated <script src="..."> as content scripts — not as
+     * page inline code — so the page's CSP does not apply.
+   *
+   * IMPORTANT: Remove the script element ONLY after the load event fires.
+   * Removing it synchronously can prevent the browser from starting the fetch,
+   * especially in Edge/Chrome with strict timing.
+   *
+   * Runs BEFORE any page JS (document_start), so we catch all HLS activity.
    */
   function injectInterceptors() {
-    const interceptCode = `
-      (function() {
-        if (window.__goon_plugin_intercepted) return;
-        window.__goon_plugin_intercepted = true;
-
-        window.__goon_plugin_data = window.__goon_plugin_data || {
-          manifests: [],
-          sources: []
-        };
-
-        // Helper: resolve relative URLs
-        function resolveUrl(url) {
-          if (!url) return null;
-          try {
-            if (url.startsWith('//')) return 'https:' + url;
-            if (url.startsWith('http')) return url;
-            return new URL(url, window.location.origin).href;
-          } catch { return null; }
-        }
-
-        // Helper: report manifest to content script via postMessage
-        function reportManifest(url, source) {
-          var resolved = resolveUrl(url);
-          if (!resolved) return;
-          if (window.__goon_plugin_data.manifests.includes(resolved)) return;
-          window.__goon_plugin_data.manifests.push(resolved);
-
-          window.postMessage({
-            type: 'GOON_PLUGIN_HLS_INTERCEPT',
-            url: resolved,
-            source: source,
-            timestamp: Date.now()
-          }, '*');
-        }
-
-        // === INTERCEPTORS ===
-
-        // 1. Intercept XMLHttpRequest for manifest-like requests
-        var originalOpen = XMLHttpRequest.prototype.open;
-        var originalSend = XMLHttpRequest.prototype.send;
-        XMLHttpRequest.prototype.open = function(method, url) {
-          this._goon_url = url;
-          return originalOpen.apply(this, arguments);
-        };
-        XMLHttpRequest.prototype.send = function(body) {
-          if (this._goon_url && typeof this._goon_url === 'string') {
-            var resolved = resolveUrl(this._goon_url);
-            if (resolved && (resolved.includes('.m3u8') ||
-                             resolved.includes('/playlist') ||
-                             resolved.includes('/manifest'))) {
-              reportManifest(resolved, 'xhr');
-            }
-          }
-          return originalSend.apply(this, arguments);
-        };
-
-        // 2. Intercept fetch() for manifest-like requests
-        var originalFetch = window.fetch;
-        window.fetch = function(resource, init) {
-          var url = typeof resource === 'string' ? resource : (resource && resource.url);
-          if (url && typeof url === 'string') {
-            var resolved = resolveUrl(url);
-            if (resolved && (resolved.includes('.m3u8') ||
-                             resolved.includes('/playlist') ||
-                             resolved.includes('/manifest'))) {
-              reportManifest(resolved, 'fetch');
-            }
-          }
-          return originalFetch.apply(this, arguments);
-        };
-
-        // 3. Intercept HLS.js loadSource (catches HLS.js instances)
-        function patchHlsPrototype() {
-          if (typeof Hls === 'undefined') return;
-          var originalLoadSource = Hls.prototype.loadSource;
-          if (!originalLoadSource) return;
-
-          Hls.prototype.loadSource = function(url) {
-            reportManifest(url, 'hls_loadSource');
-            return originalLoadSource.apply(this, arguments);
-          };
-
-          var originalAttachMedia = Hls.prototype.attachMedia;
-          if (originalAttachMedia) {
-            Hls.prototype.attachMedia = function(media) {
-              if (media && media.tagName === 'VIDEO') {
-                media._goon_hls_manifest = this.url;
-                reportManifest(this.url, 'hls_attachMedia');
-              }
-              return originalAttachMedia.apply(this, arguments);
-            };
-          }
-        }
-
-        // Patch immediately if HLS is already defined
-        patchHlsPrototype();
-
-        // Watch for HLS.js to be dynamically defined later
-        var originalDefineProperty = Object.defineProperty;
-        var hlsPatched = false;
-        Object.defineProperty = function(obj, prop, descriptor) {
-          var result = originalDefineProperty.apply(this, arguments);
-          if (obj === window && prop === 'Hls' && !hlsPatched) {
-            hlsPatched = true;
-            patchHlsPrototype();
-          }
-          return result;
-        };
-
-      })();
-    `;
-
     const script = document.createElement('script');
-    script.textContent = interceptCode;
+    script.src = chrome.runtime.getURL('interceptors.js');
     script.setAttribute('type', 'text/javascript');
-    (document.head || document.documentElement).appendChild(script);
-    // Remove the script element after execution but keep interceptors active
+    script.onload = function () {
+      // Script loaded and executed — safe to remove the element now
+      if (script.parentNode) {
         script.parentNode.removeChild(script);
       }
+    };
+    (document.head || document.documentElement).appendChild(script);
+    // Keep the element in the DOM — onload will remove it after execution
+  }
 
   // Inject immediately at document_start
   injectInterceptors();
@@ -163,7 +67,8 @@
           source: source,
           timestamp: event.data.timestamp
         });
-        console.log('[goon-plugin] Intercepted HLS manifest via', source, ':', url);
+        console.log('[vidplex-plugin] Intercepted HLS manifest via', source, ':', url);
+        console.log('[vidplex-plugin] Total intercepted manifests so far:', interceptedManifests.length);
       }
     }
   });
@@ -190,34 +95,76 @@
             return url;
           }
         }
-      } catch(e) {}
+      } catch {}
     }
     return null;
   }
 
   /**
-   * Get video data: intercepted manifests + DOM scan + poster.
+   * Get video data: intercepted manifests + DOM scan + poster + Hls.cast probe.
    * Called by the popup via chrome.tabs.sendMessage.
    */
   function getVideoData() {
     const poster = extractPoster();
+    console.log('[vidplex-content] getVideoData called. Poster:', poster);
+    console.log('[vidplex-content] Intercepted manifests count:', interceptedManifests.length);
+    if (interceptedManifests.length > 0) {
+      console.log('[vidplex-content] Manifest details:', JSON.stringify(interceptedManifests.map(m => ({ url: m.url, source: m.source }))));
+    }
 
     // DOM video scan (isolated world — can access DOM but not page JS)
     const videoElements = [];
     try {
       const videos = document.querySelectorAll('video');
+      console.log('[vidplex-content] Found', videos.length, '<video> elements in DOM');
       for (const video of videos) {
         const style = window.getComputedStyle(video);
-        if (style.display !== 'none' && video.clientWidth > 0 && video.clientHeight > 0) {
+        const isVisible = style.display !== 'none' && video.clientWidth > 0 && video.clientHeight > 0;
+        console.log('[vidplex-content] Video:', {
+          src: (video.currentSrc || video.src || '').substring(0, 120),
+          visible: isVisible,
+          dimensions: video.clientWidth + 'x' + video.clientHeight,
+          networkState: video.networkState,
+          readyState: video.readyState,
+        });
+        if (isVisible) {
+          // Extract buffered ranges as serializable arrays
+          const bufferedRanges = [];
+          if (video.buffered && video.buffered.length > 0) {
+            for (let b = 0; b < video.buffered.length; b++) {
+              bufferedRanges.push({ start: video.buffered.start(b), end: video.buffered.end(b) });
+            }
+          }
+
           videoElements.push({
             src: video.currentSrc || video.src || '',
             poster: video.poster || '',
             width: video.clientWidth,
             height: video.clientHeight,
+            duration: video.duration || 0,
+            buffered: bufferedRanges,
           });
         }
       }
-    } catch(e) { /* ignore DOM access errors */ }
+    } catch(e) { /* ignore DOM access errors */
+      console.warn('[vidplex-content] DOM scan error:', e && e.message ? e.message : e);
+    }
+
+    console.log('[vidplex-content] Visible video elements:', videoElements.length);
+    // Expose interceptor data globally so the popup's deep probe can read it.
+    window.__goon_plugin_data = window.__goon_plugin_data || {
+      manifests: [],
+      sources: [],
+      _contentType: 'content-script',
+    };
+    // Merge our intercepted manifests into the shared data store (the interceptors
+    // write their own URLs here; we add content-script-level XHR intercepts).
+    for (const m of interceptedManifests) {
+      if (!window.__goon_plugin_data.manifests.includes(m.url)) {
+        window.__goon_plugin_data.manifests.push(m.url);
+        window.__goon_plugin_data.sources.push(m.source);
+      }
+    }
 
     return {
       posterUrl: poster,
@@ -236,5 +183,5 @@
     return false;
   });
 
-  console.log('[goon-plugin] Content script loaded. Interceptors injected at document_start.');
+  console.log('[vidplex-plugin] Content script loaded. Interceptors injected at document_start.');
 })();

src/icons/icon.svg

@@ -1,4 +1,4 @@
 <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 128 128">
   <rect width="128" height="128" rx="24" fill="#4361ee"/>
-  <text x="64" y="84" text-anchor="middle" dominant-baseline="middle" font-size="64" font-weight="bold" font-family="sans-serif" fill="white">G</text>
+  <text x="64" y="84" text-anchor="middle" dominant-baseline="middle" font-size="64" font-weight="bold" font-family="sans-serif" fill="white">V</text>
 </svg>

src/inject/hls.min.js

@@ -0,0 +1,2 @@
+!function t(e){var r,i;r=this,i=function(){"use strict";function r(t,e){var r=Object.keys(t);if(Object.getOwnPropertySymbols){var i=Object.getOwnPropertySymbols(t);e&&(i=i.filter((function(e){return Object.getOwnPropertyDescriptor(t,e).enumerable}))),r.push.apply(r,i)}return r}function i(t){for(var e=1;e<arguments.length;e++){var i=null!=arguments[e]?arguments[e]:{};e%2?r(Object(i),!0).forEach((function(e){var r,a,s;r=t,a=e,s=i[e],(a=n(a))in r?Object.defineProperty(r,a,{value:s,enumerable:!0,configurable:!0,writable:!0}):r[a]=s})):Object.getOwnPropertyDescriptors?Object.defineProperties(t,Object.getOwnPropertyDescriptors(i)):r(Object(i)).forEach((function(e){Object.defineProperty(t,e,Object.getOwnPropertyDescriptor(i,e))}))}return t}function n(t){var e=function(t,e){if("object"!=typeof t||!t)return t;var r=t[Symbol.toPrimitive];if(void 0!==r){var i=r.call(t,e||"default");if("object"!=typeof i)return i;throw new TypeError("@@toPrimitive must return a primitive value.")}return("string"===e?String:Number)(t)}(t,"string");return"symbol"==typeof e?e:String(e)}function a(t,e){for(var r=0;r<e.length;r++){var i=e[r];i.enumerable=i.enumerable||!1,i.configurable=!0,"value"in i&&(i.writable=!0),Object.defineProperty(t,n(i.key),i)}}function s(t,e,r){return e&&a(t.prototype,e),r&&a(t,r),Object.defineProperty(t,"prototype",{writable:!1}),t}function o(){return o=Object.assign?Object.assign.bind():function(t){for(var e=1;e<arguments.length;e++){var r=arguments[e];for(var i in r)Object.prototype.hasOwnProperty.call(r,i)&&(t[i]=r[i])}return t},o.apply(this,arguments)}function l(t,e){t.prototype=Object.create(e.prototype),t.prototype.constructor=t,h(t,e)}function u(t){return u=Object.setPrototypeOf?Object.getPrototypeOf.bind():function(t){return t.__proto__||Object.getPrototypeOf(t)},u(t)}function h(t,e){return h=Object.setPrototypeOf?Object.setPrototypeOf.bind():function(t,e){return t.__proto__=e,t},h(t,e)}function d(t,e,r){return d=function(){if("undefined"==typeof Reflect||!Reflect.construct)return!1;if(Reflect.construct.sham)return!1;if("function"==typeof Proxy)return!0;try{return Boolean.prototype.valueOf.call(Reflect.construct(Boolean,[],(function(){}))),!0}catch(t){return!1}}()?Reflect.construct.bind():function(t,e,r){var i=[null];i.push.apply(i,e);var n=new(Function.bind.apply(t,i));return r&&h(n,r.prototype),n},d.apply(null,arguments)}function c(t){var e="function"==typeof Map?new Map:void 0;return c=function(t){if(null===t||!function(t){try{return-1!==Function.toString.call(t).indexOf("[native code]")}catch(e){return"function"==typeof t}}(t))return t;if("function"!=typeof t)throw new TypeError("Super expression must either be null or a function");if(void 0!==e){if(e.has(t))return e.get(t);e.set(t,r)}function r(){return d(t,arguments,u(this).constructor)}return r.prototype=Object.create(t.prototype,{constructor:{value:r,enumerable:!1,writable:!0,configurable:!0}}),h(r,t)},c(t)}function f(t,e){(null==e||e>t.length)&&(e=t.length);for(var r=0,i=new Array(e);r<e;r++)i[r]=t[r];return i}function g(t,e){var r="undefined"!=typeof Symbol&&t[Symbol.iterator]||t["@@iterator"];if(r)return(r=r.call(t)).next.bind(r);if(Array.isArray(t)||(r=function(t,e){if(t){if("string"==typeof t)return f(t,e);var r=Object.prototype.toString.call(t).slice(8,-1);return"Object"===r&&t.constructor&&(r=t.constructor.name),"Map"===r||"Set"===r?Array.from(t):"Arguments"===r||/^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(r)?f(t,e):void 0}}(t))||e&&t&&"number"==typeof t.length){r&&(t=r);var i=0;return function(){return i>=t.length?{done:!0}:{done:!1,value:t[i++]}}}throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method.")}function v(t){return t&&t.__esModule&&Object.prototype.hasOwnProperty.call(t,"default")?t.default:t}var m={exports:{}};!function(t,e){var r,i,n,a,s;r=/^(?=((?:[a-zA-Z0-9+\-.]+:)?))\1(?=((?:\/\/[^\/?#]*)?))\2(?=((?:(?:[^?#\/]*\/)*[^;?#\/]*)?))\3((?:;[^?#]*)?)(\?[^#]*)?(#[^]*)?$/,i=/^(?=([^\/?#]*))\1([^]*)$/,n=/(?:\/|^)\.(?=\/)/g,a=/(?:\/|^)\.\.\/(?!\.\.\/)[^\/]*(?=\/)/g,s={buildAbsoluteURL:function(t,e,r){if(r=r||{},t=t.trim(),!(e=e.trim())){if(!r.alwaysNormalize)return t;var n=s.parseURL(t);if(!n)throw new Error("Error trying to parse base URL.");return n.path=s.normalizePath(n.path),s.buildURLFromParts(n)}var a=s.parseURL(e);if(!a)throw new Error("Error trying to parse relative URL.");if(a.scheme)return r.alwaysNormalize?(a.path=s.normalizePath(a.path),s.buildURLFromParts(a)):e;var o=s.parseURL(t);if(!o)throw new Error("Error trying to parse base URL.");if(!o.netLoc&&o.path&&"/"!==o.path[0]){var l=i.exec(o.path);o.netLoc=l[1],o.path=l[2]}o.netLoc&&!o.path&&(o.path="/");var u={scheme:o.scheme,netLoc:a.netLoc,path:null,params:a.params,query:a.query,fragment:a.fragment};if(!a.netLoc&&(u.netLoc=o.netLoc,"/"!==a.path[0]))if(a.path){var h=o.path,d=h.substring(0,h.lastIndexOf("/")+1)+a.path;u.path=s.normalizePath(d)}else u.path=o.path,a.paramsLine truncated
+//# sourceMappingURL=hls.min.js.map

src/inject/interceptors.js

@@ -0,0 +1,169 @@
+/**
+ * interceptors.js — Main-world interceptors for HLS manifest detection.
+ *
+ * This file is injected into the main world via a <script src="..."> tag
+ * (NOT inline textContent) to bypass strict CSP on sites that restrict
+ * script-src.
+ *
+ * When loaded as an external script from the extension origin, Chrome treats
+ * it as an extension content script — not as page inline code — so the
+ * page's script-src CSP does not apply.
+ *
+ * Loaded by content.js at document_start before any page JS runs.
+ */
+
+(function () {
+  'use strict';
+
+  if (window.__goon_plugin_intercepted) return;
+  window.__goon_plugin_intercepted = true;
+
+  window.__goon_plugin_data = window.__goon_plugin_data || {
+    manifests: [],
+    sources: [],
+  };
+
+  // Helper: resolve relative URLs
+  function resolveUrl(url) {
+    if (!url) return null;
+    try {
+      if (url.startsWith('//')) return 'https:' + url;
+      if (url.startsWith('http')) return url;
+      return new URL(url, window.location.origin).href;
+    } catch {
+      return null;
+    }
+  }
+
+  // Helper: check if a URL looks like an HLS manifest
+  function isManifestUrl(url) {
+    var u = url.toLowerCase();
+    return u.includes('.m3u8') || u.includes('.hlsvod') ||
+           u.includes('/hls/') || u.includes('/playlist') || u.includes('/manifest');
+  }
+
+  // Helper: report manifest to content script via postMessage
+  function reportManifest(url, source) {
+    var resolved = resolveUrl(url);
+    if (!resolved) return;
+    if (window.__goon_plugin_data.manifests.includes(resolved)) return;
+    window.__goon_plugin_data.manifests.push(resolved);
+
+    window.postMessage(
+      {
+        type: 'GOON_PLUGIN_HLS_INTERCEPT',
+        url: resolved,
+        source: source,
+        timestamp: Date.now(),
+      },
+      '*',
+    );
+  }
+
+  // === INTERCEPTORS ===
+
+  // 1. Intercept XMLHttpRequest for manifest-like requests
+  var originalOpen = XMLHttpRequest.prototype.open;
+  var originalSend = XMLHttpRequest.prototype.send;
+  XMLHttpRequest.prototype.open = function (method, url) {
+    this._goon_url = url;
+    return originalOpen.apply(this, arguments);
+  };
+  XMLHttpRequest.prototype.send = function (_body) {
+    if (this._goon_url && typeof this._goon_url === 'string') {
+      var resolved = resolveUrl(this._goon_url);
+      if (resolved && isManifestUrl(resolved)) {
+        reportManifest(resolved, 'xhr');
+      }
+    }
+    return originalSend.apply(this, arguments);
+  };
+
+  // 2. Intercept fetch() for manifest-like requests
+  var originalFetch = window.fetch;
+  window.fetch = function (resource, _init) {
+    var url = typeof resource === 'string' ? resource : resource && resource.url;
+    if (url && typeof url === 'string') {
+      var resolved = resolveUrl(url);
+      if (resolved && isManifestUrl(resolved)) {
+        reportManifest(resolved, 'fetch');
+      }
+    }
+    return originalFetch.apply(this, arguments);
+  };
+
+  // 3. Intercept HLS.js loadSource (catches HLS.js instances)
+  // Guard against double-patching: only wrap if the method hasn't been patched yet.
+  var hlsPatched = false;
+  function patchHlsPrototype() {
+    if (typeof Hls === 'undefined') return;
+    if (hlsPatched) return; // Already patched — skip
+
+    var originalLoadSource = Hls.prototype.loadSource;
+    if (!originalLoadSource) return;
+
+    Hls.prototype.loadSource = function (url) {
+      reportManifest(url, 'hls_loadSource');
+      return originalLoadSource.apply(this, arguments);
+    };
+
+    var originalAttachMedia = Hls.prototype.attachMedia;
+    if (originalAttachMedia) {
+      Hls.prototype.attachMedia = function (media) {
+        if (media && media.tagName === 'VIDEO') {
+          media._goon_hls_manifest = this.url;
+          reportManifest(this.url, 'hls_attachMedia');
+        }
+        return originalAttachMedia.apply(this, arguments);
+      };
+    }
+    hlsPatched = true;
+  }
+
+  // Patch immediately if HLS is already defined
+  patchHlsPrototype();
+
+  // Watch for HLS.js to be dynamically defined later.
+  // Use a combination of:
+  // 1. Longer polling window (30s instead of 3s) to catch lazy-loaded players.
+  // 2. MutationObserver on <head> for new <script> tags — catches late hls.js loads.
+  if (!hlsPatched) {
+    var pollCount = 0;
+    var maxPolls = 600; // poll for up to ~30s (50ms interval)
+
+    var pollHls = setInterval(function () {
+      pollCount++;
+      if (typeof Hls !== 'undefined' && !hlsPatched) {
+        patchHlsPrototype();
+        if (hlsPatched) clearInterval(pollHls);
+      }
+      if (pollCount >= maxPolls) clearInterval(pollHls);
+    }, 50);
+
+    // MutationObserver: watches for new <script> tags that may load hls.js late.
+    // This catches dynamically-injected players that appear after the poll window.
+    try {
+      var observer = new MutationObserver(function (mutations) {
+        if (hlsPatched) { observer.disconnect(); return; }
+        for (var m = 0; m < mutations.length; m++) {
+          var nodes = mutations[m].addedNodes;
+          if (!nodes) continue;
+          for (var n = 0; n < nodes.length; n++) {
+            var node = nodes[n];
+            if (node.tagName === 'SCRIPT' && node.src) {
+              var src = node.src.toLowerCase();
+              if (src.includes('hls') || src.includes('videojs') || src.includes('player')) {
+                // Script tag loaded — check if Hls is now defined
+                if (typeof Hls !== 'undefined' && !hlsPatched) {
+                  patchHlsPrototype();
+                  if (hlsPatched) observer.disconnect();
+                }
+              }
+            }
+          }
+        }
+      });
+      observer.observe(document.head || document.documentElement, { childList: true, subtree: true });
+    } catch { /* MutationObserver not available — polling still works */ }
+  }
+})();

src/types.ts

@@ -14,10 +14,10 @@
 
 /**
  * Media delivery format of the video source.
- * - 'direct' : plain MP4/WebM blob served via HTTP(S)
+ * - 'video'  : plain MP4/WebM blob served via HTTP(S)
  * - 'hls'    : HTTP Live Streaming manifest (.m3u8)
  */
-export type MediaType = 'direct' | 'hls';
+export type MediaType = 'video' | 'hls';
 
 /**
  * A single video entry discovered by a tab scan.

src/viewer/index.css

@@ -32,6 +32,90 @@ h1 {
   font-weight: 600;
 }
 
+.instructions-panel {
+  display: flex;
+  flex-direction: column;
+  gap: 10px;
+  padding: 12px;
+  border: 1px solid var(--border);
+  border-radius: var(--radius);
+  background: #f8fafc;
+}
+
+.instructions-header {
+  display: flex;
+  align-items: flex-start;
+  justify-content: space-between;
+  gap: 12px;
+}
+
+.instructions-kicker {
+  margin-bottom: 2px;
+  font-size: 11px;
+  font-weight: 700;
+  letter-spacing: 0.08em;
+  text-transform: uppercase;
+  color: #64748b;
+}
+
+.instructions-panel h2 {
+  font-size: 14px;
+  line-height: 1.3;
+  font-weight: 600;
+}
+
+.instructions-toggle {
+  flex: 0 0 auto;
+  padding: 6px 10px;
+  font-size: 12px;
+  background: transparent;
+  color: var(--accent);
+  border: 1px solid var(--border);
+}
+
+.instructions-toggle:hover {
+  background: #eef2ff;
+}
+
+.instructions-body {
+  display: flex;
+  flex-direction: column;
+  gap: 8px;
+}
+
+.instructions-body[hidden] {
+  display: none;
+}
+
+.instructions-list {
+  display: flex;
+  flex-direction: column;
+  gap: 8px;
+  padding-left: 18px;
+}
+
+.instructions-list li {
+  display: flex;
+  flex-direction: column;
+  gap: 2px;
+}
+
+.instructions-list strong {
+  font-size: 12px;
+}
+
+.instructions-list span,
+.instructions-note,
+.instructions-learn-more {
+  font-size: 12px;
+  line-height: 1.45;
+  color: #475569;
+}
+
+.instructions-note {
+  color: #7c3aed;
+}
+
 button {
   padding: 8px 16px;
   background: var(--accent);

src/viewer/index.html

@@ -3,12 +3,54 @@
 <head>
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
-  <title>Goon Plugin</title>
+  <title>VidPlex</title>
   <link rel="stylesheet" href="index.css">
 </head>
 <body>
   <div id="app">
-    <h1>Goon Plugin</h1>
+    <h1>VidPlex</h1>
+    <section class="instructions-panel" role="region" aria-labelledby="instructions-title">
+      <div class="instructions-header">
+        <div>
+          <p class="instructions-kicker">Quick start</p>
+          <h2 id="instructions-title">How to use VidPlex</h2>
+        </div>
+        <button
+          id="instructions-toggle"
+          type="button"
+          class="instructions-toggle"
+          aria-expanded="true"
+          aria-controls="instructions-body"
+        >
+          Hide instructions
+        </button>
+      </div>
+      <div id="instructions-body" class="instructions-body">
+        <ol class="instructions-list">
+          <li>
+            <strong>Start your videos</strong>
+            <span>Open the videos you want to play, one per tab, and begin their playback.</span>
+          </li>
+          <li>
+            <strong>Scan videos</strong>
+            <span>Click <strong>Find Videos</strong> to search the current browser window's tabs for playing videos.</span>
+          </li>
+          <li>
+            <strong>Review the list</strong>
+            <span>Check to make sure the right number of videos was found.</span>
+          </li>
+          <li>
+            <strong>Open the viewer</strong>
+            <span>Click <strong>Open Viewer</strong> to open the grid player in a new window.</span>
+          </li>
+          <li>
+            <strong>Reset and rescan</strong>
+            <span>Click <strong>Clear</strong> to erase results and scan again.</span>
+          </li>
+        </ol>
+        <p class="instructions-note">Warning: Browser pages, extension pages, and restricted frames can hide videos, so results may be incomplete.</p>
+      </div>
+    </section>
     <button id="find-btn">Find Videos (all tabs)</button>
     <div id="video-list" class="video-list" style="display:none;"></div>
     <div id="status" class="status" style="min-height:16px;"></div>

src/viewer/index.test.js

@@ -0,0 +1,481 @@
+/**
+ * index.test.js - Unit tests for popup scanning pipeline helpers.
+ *
+ * Verifies that the exported pipeline functions correctly handle:
+ * - HLS metadata preservation through dedup
+ * - Tab filtering (system URLs excluded)
+ * - Manifest deduplication and prioritization
+ * - Video entry normalization
+ */
+import { describe, it, expect } from 'vitest';
+
+/* ========================================================================== */
+/* Simulated pipeline helpers (mirror of index.js exported functions)        */
+/* ========================================================================== */
+
+/**
+ * Simulate `filterValidTabs` from index.js.
+ */
+function filterValidTabs(tabs) {
+  const SYSTEM_PREFIXES = ['chrome://', 'chrome-extension://', 'edge://', 'about:', 'view-source:'];
+  return tabs.filter(t =>
+    t.url && !SYSTEM_PREFIXES.some(prefix => t.url.startsWith(prefix))
+  );
+}
+
+/**
+ * Simulate `dedupManifests` from index.js.
+ */
+function dedupManifests(allManifests) {
+  const seenUrls = new Set();
+  const unique = allManifests.filter(m => {
+    if (seenUrls.has(m.url)) return false;
+    seenUrls.add(m.url);
+    return true;
+  });
+  unique.sort((a, b) => {
+    const aInline = a.player === 'inline-script' ? 1 : 0;
+    const bInline = b.player === 'inline-script' ? 1 : 0;
+    return aInline - bInline;
+  });
+  return unique;
+}
+
+/**
+ * Simulate `makeVideoEntry` from index.js.
+ */
+function makeVideoEntry(video, tabTitle) {
+  const entry = {
+    src: video.hlsManifest || video.src || '',
+    poster: video.poster || null,
+    tab: tabTitle,
+    mediaType: video.mediaType || 'video',
+  };
+  if (video.hlsManifest) entry.hlsManifest = video.hlsManifest;
+  return entry;
+}
+
+/**
+ * Simulate the dedup + storage pipeline from index.js scanVideos().
+ * Matches the current hls-fix pipeline (single-frame results, not multi-frame).
+ */
+function simulateStoragePipeline(tabResults) {
+  const seen = new Map();
+  for (const group of tabResults) {
+    if (!group.result || !group.result.videos?.length) continue;
+    for (const v of group.result.videos) {
+      const primarySrc = v.hlsManifest || v.src || '(empty)';
+      const key = primarySrc + '||' + (v.poster || '(none)');
+      if (!seen.has(key)) {
+        seen.set(key, makeVideoEntry(v, group.tabTitle));
+      }
+    }
+  }
+  const items = [...seen.values()];
+
+  // Storage format
+  const storedItems = items.map(v => ({
+    src: v.src,
+    poster: v.poster,
+    tab: v.tab,
+    mediaType: v.mediaType || 'video',
+    hlsManifest: v.hlsManifest || undefined,
+  }));
+
+  return { storedItems };
+}
+
+/* ========================================================================== */
+/* TESTS: Tab filtering                                                     */
+/* ========================================================================== */
+
+describe('filterValidTabs', () => {
+  it('excludes chrome:// URLs', () => {
+    const tabs = [{ url: 'chrome://settings' }, { url: 'https://example.com' }];
+    const result = filterValidTabs(tabs);
+    expect(result).toHaveLength(1);
+    expect(result[0].url).toBe('https://example.com');
+  });
+
+  it('excludes chrome-extension:// URLs', () => {
+    const tabs = [{ url: 'chrome-extension://abc/viewer.html' }];
+    expect(filterValidTabs(tabs)).toHaveLength(0);
+  });
+
+  it('excludes edge:// URLs', () => {
+    const tabs = [{ url: 'edge://settings' }];
+    expect(filterValidTabs(tabs)).toHaveLength(0);
+  });
+
+  it('excludes about: URLs', () => {
+    const tabs = [{ url: 'about:blank' }];
+    expect(filterValidTabs(tabs)).toHaveLength(0);
+  });
+
+  it('excludes view-source: URLs', () => {
+    const tabs = [{ url: 'view-source:https://example.com' }];
+    expect(filterValidTabs(tabs)).toHaveLength(0);
+  });
+
+  it('includes null/empty url tabs', () => {
+    const tabs = [{ url: '' }, { url: null }, { url: 'https://example.com' }];
+    const result = filterValidTabs(tabs);
+    expect(result).toHaveLength(1);
+  });
+});
+
+/* ========================================================================== */
+/* TESTS: Manifest dedup and prioritization                                 */
+/* ========================================================================== */
+
+describe('dedupManifests', () => {
+  it('removes duplicate URLs', () => {
+    const manifests = [
+      { url: 'https://a.com/1.m3u8', player: 'hls' },
+      { url: 'https://a.com/1.m3u8', player: 'inline-script' },
+      { url: 'https://b.com/2.m3u8', player: 'hls' },
+    ];
+    const result = dedupManifests(manifests);
+    expect(result).toHaveLength(2);
+    expect(result[0].url).toBe('https://a.com/1.m3u8');
+  });
+
+  it('prefers player-sourced manifests over inline-script', () => {
+    const manifests = [
+      { url: 'https://a.com/1.m3u8', player: 'inline-script' },
+      { url: 'https://a.com/1.m3u8', player: 'hls' },
+    ];
+    const result = dedupManifests(manifests);
+    expect(result).toHaveLength(1);
+    expect(result[0].player).toBe('inline-script'); // first occurrence wins
+  });
+});
+
+/* ========================================================================== */
+/* TESTS: Video entry normalization                                         */
+/* ========================================================================== */
+
+describe('makeVideoEntry', () => {
+  it('normalizes HLS video entry', () => {
+    const video = {
+      src: 'blob:https://example.com/xyz',
+      poster: 'https://example.com/thumb.jpg',
+      mediaType: 'hls',
+      hlsManifest: 'https://cdn.example.com/stream.m3u8',
+    };
+    const entry = makeVideoEntry(video, 'Example Page');
+    expect(entry.src).toBe('https://cdn.example.com/stream.m3u8');
+    expect(entry.poster).toBe('https://example.com/thumb.jpg');
+    expect(entry.tab).toBe('Example Page');
+    expect(entry.mediaType).toBe('hls');
+    expect(entry.hlsManifest).toBe('https://cdn.example.com/stream.m3u8');
+  });
+
+  it('normalizes standard video entry', () => {
+    const video = {
+      src: 'https://example.com/video.mp4',
+      poster: null,
+      mediaType: 'video',
+    };
+    const entry = makeVideoEntry(video, 'MP4 Page');
+    expect(entry.src).toBe('https://example.com/video.mp4');
+    expect(entry.mediaType).toBe('video');
+    expect(entry.hlsManifest).toBeUndefined();
+  });
+
+  it('handles missing mediaType (defaults to video)', () => {
+    const video = {
+      src: 'https://example.com/video.webm',
+    };
+    const entry = makeVideoEntry(video, 'WebM Page');
+    expect(entry.mediaType).toBe('video');
+  });
+});
+
+/* ========================================================================== */
+/* TESTS: Storage pipeline (HLS metadata preservation)                      */
+/* ========================================================================== */
+
+describe('Storage pipeline - HLS metadata preservation', () => {
+  it('preserves HLS metadata through dedup', () => {
+    const tabResults = [{
+      tabTitle: 'HLS Stream Page',
+      result: {
+        videos: [{
+          src: 'https://example.com/stream.m3u8',
+          poster: null,
+          mediaType: 'hls',
+          hlsManifest: 'https://example.com/stream.m3u8',
+        }],
+        videoCount: 1,
+      },
+    }];
+
+    const { storedItems } = simulateStoragePipeline(tabResults);
+    expect(storedItems[0].mediaType).toBe('hls');
+    expect(storedItems[0].hlsManifest).toBe('https://example.com/stream.m3u8');
+  });
+
+  it('preserves hlsManifest for live streams', () => {
+    const tabResults = [{
+      tabTitle: 'Live Stream',
+      result: {
+        videos: [{
+          src: 'https://cdn.example.com/live.m3u8',
+          poster: 'https://cdn.example.com/thumb.jpg',
+          mediaType: 'hls',
+          hlsManifest: 'https://cdn.example.com/live.m3u8',
+        }],
+        videoCount: 1,
+      },
+    }];
+
+    const { storedItems } = simulateStoragePipeline(tabResults);
+    expect(storedItems[0].hlsManifest).toBe('https://cdn.example.com/live.m3u8');
+    expect(storedItems[0].mediaType).toBe('hls');
+  });
+
+  it('preserves standard video entries correctly', () => {
+    const tabResults = [{
+      tabTitle: 'MP4 Page',
+      result: {
+        videos: [{
+          src: 'https://example.com/video.mp4',
+          poster: 'https://example.com/thumb.jpg',
+          mediaType: 'video',
+        }],
+        videoCount: 1,
+      },
+    }];
+
+    const { storedItems } = simulateStoragePipeline(tabResults);
+    expect(storedItems[0].src).toBe('https://example.com/video.mp4');
+    expect(storedItems[0].mediaType).toBe('video');
+    expect(storedItems[0].poster).toBe('https://example.com/thumb.jpg');
+    expect(storedItems[0].tab).toBe('MP4 Page');
+  });
+
+  it('deduplicates across tabs by hlsManifest', () => {
+    const tabResults = [
+      {
+        tabTitle: 'Tab 1',
+        result: {
+          videos: [{
+            src: 'https://example.com/stream.m3u8',
+            poster: null,
+            mediaType: 'hls',
+            hlsManifest: 'https://example.com/stream.m3u8',
+          }],
+          videoCount: 1,
+        },
+      },
+      {
+        tabTitle: 'Tab 2',
+        result: {
+          videos: [{
+            src: 'https://example.com/stream.m3u8',
+            poster: null,
+            mediaType: 'hls',
+            hlsManifest: 'https://example.com/stream.m3u8',
+          }],
+          videoCount: 1,
+        },
+      },
+    ];
+
+    const { storedItems } = simulateStoragePipeline(tabResults);
+    expect(storedItems).toHaveLength(1);
+    expect(storedItems[0].tab).toBe('Tab 1'); // first tab wins
+  });
+
+  it('keeps different HLS streams from same tab', () => {
+    const tabResults = [{
+      tabTitle: 'Mixed Page',
+      result: {
+        videos: [{
+          src: 'https://example.com/live.m3u8',
+          poster: null,
+          mediaType: 'hls',
+          hlsManifest: 'https://example.com/live.m3u8',
+        }],
+        videoCount: 1,
+      },
+    }, {
+      tabTitle: 'Recording Page',
+      result: {
+        videos: [{
+          src: 'https://example.com/recording.mp4',
+          poster: 'https://example.com/thumb.jpg',
+          mediaType: 'video',
+        }],
+        videoCount: 1,
+      },
+    }];
+
+    const { storedItems } = simulateStoragePipeline(tabResults);
+    expect(storedItems).toHaveLength(2);
+    expect(storedItems[0].mediaType).toBe('hls');
+    expect(storedItems[1].mediaType).toBe('video');
+  });
+
+  it('skips tabs with no video results', () => {
+    const tabResults = [
+      { tabTitle: 'Empty Tab', result: null },
+      { tabTitle: 'No Videos', result: { videos: [], videoCount: 0 } },
+      {
+        tabTitle: 'Has Video',
+        result: {
+          videos: [{
+            src: 'https://example.com/video.mp4',
+            poster: null,
+            mediaType: 'video',
+          }],
+          videoCount: 1,
+        },
+      },
+    ];
+
+    const { storedItems } = simulateStoragePipeline(tabResults);
+    expect(storedItems).toHaveLength(1);
+    expect(storedItems[0].tab).toBe('Has Video');
+  });
+});
+
+/* ========================================================================== */
+/* TESTS: scrapeFn — HLS detection strategies                                */
+/* ========================================================================== */
+
+/**
+ * Minimal DOM setup for scrapeFn tests.
+ * Simulates how scrapeFn detects HLS manifests from video elements
+ * using the 5-priority chain.
+ */
+function simulateScrapeFn(videos, hlsManifests) {
+  // Simulate the scrapeFn detection logic (priorities 1-5)
+  const results = [];
+  for (const v of videos) {
+    const rawSrc = v.currentSrc || v.src || '';
+    let hlsManifest = null;
+    let mediaType = 'video';
+    let src = rawSrc;
+
+    // Priority 1: Direct .m3u8 source
+    if (rawSrc.includes('.m3u8') && rawSrc.startsWith('http')) {
+      hlsManifest = rawSrc;
+      mediaType = 'hls';
+    }
+    // Priority 2: Interceptor annotation
+    else if (v._goon_hls_manifest) {
+      hlsManifest = v._goon_hls_manifest;
+      mediaType = 'hls';
+      src = hlsManifest;
+    }
+    // Priority 3: Hls.cast (simulated via v._hls_cast_result)
+    else if (v._hls_cast_result && v._hls_cast_result.url) {
+      hlsManifest = v._hls_cast_result.url;
+      mediaType = 'hls';
+      src = hlsManifest;
+    }
+    // Priority 4: Direct HTTP source (non-blob)
+    if (!hlsManifest && rawSrc.startsWith('http') && !rawSrc.startsWith('blob:')) {
+      mediaType = 'video';
+    }
+    // Priority 5: Deep probe fallback
+    if (!hlsManifest && hlsManifests && hlsManifests.length > 0) {
+      hlsManifest = hlsManifests[0].url || hlsManifests[0];
+      mediaType = 'hls';
+      src = hlsManifest;
+    }
+
+    results.push({ src, hlsManifest, mediaType });
+  }
+  return results;
+}
+
+describe('scrapeFn — HLS detection priorities', () => {
+  it('Priority 1: Direct .m3u8 in video.src', () => {
+    const videos = [{
+      src: 'https://example.com/stream.m3u8',
+      currentSrc: 'https://example.com/stream.m3u8',
+    }];
+    const result = simulateScrapeFn(videos, []);
+    expect(result[0].mediaType).toBe('hls');
+    expect(result[0].hlsManifest).toBe('https://example.com/stream.m3u8');
+  });
+
+  it('Priority 2: Interceptor-set _goon_hls_manifest overrides blob src', () => {
+    const videos = [{
+      src: 'blob:https://example.com/xyz',
+      currentSrc: 'blob:https://example.com/xyz',
+      _goon_hls_manifest: 'https://cdn.example.com/live.m3u8',
+    }];
+    const result = simulateScrapeFn(videos, []);
+    expect(result[0].mediaType).toBe('hls');
+    expect(result[0].hlsManifest).toBe('https://cdn.example.com/live.m3u8');
+  });
+
+  it('Priority 3: Hls.cast(video) detects active HLS instance', () => {
+    const videos = [{
+      src: 'blob:https://example.com/abc',
+      currentSrc: 'blob:https://example.com/abc',
+      _hls_cast_result: { url: 'https://cdn.example.com/vod.m3u8' },
+    }];
+    const result = simulateScrapeFn(videos, []);
+    expect(result[0].mediaType).toBe('hls');
+    expect(result[0].hlsManifest).toBe('https://cdn.example.com/vod.m3u8');
+  });
+
+  it('Priority 4: blob src with no HLS detection → filtered out', () => {
+    const videos = [{
+      src: 'blob:https://example.com/def',
+      currentSrc: 'blob:https://example.com/def',
+    }];
+    const result = simulateScrapeFn(videos, []);
+    expect(result[0].mediaType).toBe('video');
+    expect(result[0].hlsManifest).toBeNull();
+  });
+
+  it('Priority 5: Deep probe fallback when no direct HLS found', () => {
+    const videos = [{
+      src: 'https://example.com/page.html',
+      currentSrc: 'blob:https://example.com/ghi',
+    }];
+    const manifests = [{ url: 'https://cdn.example.com/fallback.m3u8' }];
+    const result = simulateScrapeFn(videos, manifests);
+    expect(result[0].mediaType).toBe('hls');
+    expect(result[0].hlsManifest).toBe('https://cdn.example.com/fallback.m3u8');
+  });
+
+  it('Priority 2 overrides Priority 5 (interceptor wins over deep probe)', () => {
+    const videos = [{
+      src: 'blob:https://example.com/jkl',
+      currentSrc: 'blob:https://example.com/jkl',
+      _goon_hls_manifest: 'https://cdn.example.com/interceptor.m3u8',
+    }];
+    const manifests = [{ url: 'https://cdn.example.com/deepprobe.m3u8' }];
+    const result = simulateScrapeFn(videos, manifests);
+    expect(result[0].mediaType).toBe('hls');
+    expect(result[0].hlsManifest).toBe('https://cdn.example.com/interceptor.m3u8');
+  });
+
+  it('HLS instance on video with no currentSrc still detected via interceptor', () => {
+    const videos = [{
+      src: '',
+      currentSrc: '',
+      _goon_hls_manifest: 'https://cdn.example.com/early.m3u8',
+    }];
+    const result = simulateScrapeFn(videos, []);
+    expect(result[0].mediaType).toBe('hls');
+    expect(result[0].hlsManifest).toBe('https://cdn.example.com/early.m3u8');
+  });
+
+  it('Direct MP4 source is not falsely flagged as HLS', () => {
+    const videos = [{
+      src: 'https://example.com/video.mp4',
+      currentSrc: 'https://example.com/video.mp4',
+    }];
+    const result = simulateScrapeFn(videos, []);
+    expect(result[0].mediaType).toBe('video');
+    expect(result[0].hlsManifest).toBeNull();
+  });
+});

src/viewer/schema.json

@@ -33,6 +33,11 @@
       "type": "string",
       "enum": ["direct", "hls"],
       "description": "Media delivery format. Defaults to 'direct' when omitted. Set to 'hls' for HTTP Live Streaming."
+    },
+    "referer": {
+      "type": ["string", "null"],
+      "format": "uri",
+      "description": "Provider Referer captured at scan time for the manifest's CDN; the proxy sends it so a referer-protecting CDN accepts sibling edge subdomains. Optional."
     }
   },
   "additionalProperties": false,

src/viewer/viewer.html

@@ -3,7 +3,7 @@
 <head>
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
-  <title>Goon Viewer</title>
+  <title>VidPlex Viewer</title>
   <link rel="stylesheet" href="viewer.css">
 </head>
 <body>

src/viewer/viewer.test.js

@@ -0,0 +1,976 @@
+/**
+ * viewer.test.js — Integration tests for viewer.js panel rendering.
+ *
+ * Verifies that:
+ * - HLS entries (mediaType: 'hls') render with data-hls-manifest + data-media-type attributes
+ * - Standard video entries render with src set
+ * - Edge cases (invalid manifests, missing fields, string URLs) are handled correctly
+ */
+import { describe, it, expect, beforeEach } from 'vitest';
+import { JSDOM } from 'jsdom';
+
+/* ------------------------------------------------------------------ */
+/* Helpers: mount a minimal DOM that mimics viewer.html               */
+/* ------------------------------------------------------------------ */
+
+function mountViewerDOM() {
+  const html = `
+    <!DOCTYPE html>
+    <html lang="en">
+    <head><title>Goon Viewer</title></head>
+    <body>
+      <div id="panels"></div>
+    </body>
+    </html>
+  `;
+
+  const dom = new JSDOM(html, {
+    url: 'chrome-extension://test/viewer/viewer.html?id=test123&grid=2',
+    runScripts: 'dangerously',
+  });
+
+  return {
+    dom,
+    window: dom.window,
+    document: dom.window.document,
+    panelsEl: dom.window.document.getElementById('panels'),
+    location: dom.window.location,
+    URLSearchParams: dom.window.URLSearchParams,
+  };
+}
+
+/* ------------------------------------------------------------------ */
+/* Simulate the panel-rendering loop from viewer.js (init function)   */
+/* ------------------------------------------------------------------ */
+
+/**
+ * Reproduce the exact panel-rendering logic from viewer.js so we can
+ * unit-test it without chrome.storage or live browser globals.
+ */
+function renderPanels(panelsEl, videoUrls, gridN, tags) {
+  const totalPanels = gridN * gridN;
+
+  for (let i = 0; i < totalPanels; i++) {
+    const panel = panelsEl.ownerDocument.createElement('div');
+    panel.classList.add('panel');
+
+    if (i < videoUrls.length && videoUrls[i]) {
+      const entry = (typeof videoUrls[i] === 'object') ? videoUrls[i] : { src: videoUrls[i] };
+      const mediaType = entry.mediaType || 'video';
+      const video = panelsEl.ownerDocument.createElement('video');
+      video.autoplay = true;
+      video.muted = true;
+      video.loop = true;
+      video.playsInline = true;
+
+      // Set poster if available
+      if (entry.poster) {
+        video.poster = entry.poster;
+      }
+
+      if (mediaType === 'hls' && entry.hlsManifest) {
+        // HLS stream
+        video.dataset.hlsManifest = entry.hlsManifest;
+        video.dataset.mediaType = 'hls';
+      } else {
+        // Direct video source
+        video.src = entry.src || entry.url || '';
+      }
+
+      panel.appendChild(video);
+
+      // Add tab label if available
+      if (tags && tags[i]) {
+        const label = panelsEl.ownerDocument.createElement('div');
+        label.className = 'panel-label';
+        label.textContent = tags[i];
+        panel.appendChild(label);
+      }
+    } else {
+      panel.classList.add('empty');
+    }
+
+    panelsEl.appendChild(panel);
+  }
+
+  panelsEl.style.gridTemplateColumns = `repeat(${gridN}, 1fr)`;
+  panelsEl.style.gridTemplateRows = `repeat(${gridN}, 1fr)`;
+}
+
+/* ========================================================================== */
+/* TESTS */
+/* ========================================================================== */
+
+describe('HLS playback — panel rendering', () => {
+  let panelsEl;
+
+  beforeEach(() => {
+    // Re-mount fresh DOM before each test
+    panelsEl = mountViewerDOM().panelsEl;
+  });
+
+  it('renders HLS entry with data-hls-manifest and data-media-type attributes', () => {
+    const entries = [
+      { mediaType: 'hls', hlsManifest: 'https://example.com/stream.m3u8', src: '' },
+    ];
+    renderPanels(panelsEl, entries, 1, []);
+
+    const video = panelsEl.querySelector('video');
+    expect(video).not.toBeNull();
+    expect(video.dataset.hlsManifest).toBe('https://example.com/stream.m3u8');
+    expect(video.dataset.mediaType).toBe('hls');
+    // HLS videos should NOT have src set to the manifest — src attribute is absent
+    expect(video.hasAttribute('src')).toBe(false);
+  });
+
+  it('renders multiple HLS entries in a grid', () => {
+    const entries = [
+      { mediaType: 'hls', hlsManifest: 'https://a.com/1.m3u8' },
+      { mediaType: 'hls', hlsManifest: 'https://b.com/2.m3u8' },
+      { mediaType: 'hls', hlsManifest: 'https://c.com/3.m3u8' },
+      { mediaType: 'hls', hlsManifest: 'https://d.com/4.m3u8' },
+    ];
+    renderPanels(panelsEl, entries, 2, []);
+
+    const videos = panelsEl.querySelectorAll('video');
+    expect(videos.length).toBe(4);
+    expect(videos[0].dataset.hlsManifest).toBe('https://a.com/1.m3u8');
+    expect(videos[1].dataset.hlsManifest).toBe('https://b.com/2.m3u8');
+    expect(videos[2].dataset.hlsManifest).toBe('https://c.com/3.m3u8');
+    expect(videos[3].dataset.hlsManifest).toBe('https://d.com/4.m3u8');
+    videos.forEach(v => expect(v.dataset.mediaType).toBe('hls'));
+  });
+
+  it('sets poster image on HLS entries', () => {
+    const entries = [
+      {
+        mediaType: 'hls',
+        hlsManifest: 'https://example.com/stream.m3u8',
+        poster: 'https://example.com/thumb.jpg',
+      },
+    ];
+    renderPanels(panelsEl, entries, 1, []);
+
+    const video = panelsEl.querySelector('video');
+    expect(video.poster).toBe('https://example.com/thumb.jpg');
+  });
+
+  it('ignores hlsManifest when mediaType is not "hls"', () => {
+    // An entry that has hlsManifest but mediaType is 'video' should play as direct src
+    const entries = [
+      { mediaType: 'video', src: 'https://example.com/video.mp4', hlsManifest: 'https://example.com/stream.m3u8' },
+    ];
+    renderPanels(panelsEl, entries, 1, []);
+
+    const video = panelsEl.querySelector('video');
+    expect(video.src).toBe('https://example.com/video.mp4');
+    expect(video.dataset.hlsManifest).toBeUndefined();
+    expect(video.dataset.mediaType).toBeUndefined();
+  });
+
+  it('renders HLS entry with hlsManifest but no src', () => {
+    const entries = [
+      { mediaType: 'hls', hlsManifest: 'https://example.com/stream.m3u8' },
+    ];
+    renderPanels(panelsEl, entries, 1, []);
+
+    const video = panelsEl.querySelector('video');
+    expect(video.dataset.hlsManifest).toBe('https://example.com/stream.m3u8');
+    expect(video.dataset.mediaType).toBe('hls');
+  });
+
+  it('renders tab labels alongside HLS entries', () => {
+    const entries = [
+      { mediaType: 'hls', hlsManifest: 'https://example.com/stream.m3u8' },
+    ];
+    renderPanels(panelsEl, entries, 1, ['Live Stream']);
+
+    const video = panelsEl.querySelector('video');
+    const label = panelsEl.querySelector('.panel-label');
+    expect(video).not.toBeNull();
+    expect(label).not.toBeNull();
+    expect(label.textContent).toBe('Live Stream');
+  });
+});
+
+describe('Standard video playback — regression tests', () => {
+  let { panelsEl } = mountViewerDOM();
+
+  beforeEach(() => {
+    const fresh = mountViewerDOM();
+    panelsEl = fresh.panelsEl;
+  });
+
+  it('renders direct MP4 URLs as src', () => {
+    const entries = [
+      { src: 'https://example.com/video.mp4' },
+    ];
+    renderPanels(panelsEl, entries, 1, []);
+
+    const video = panelsEl.querySelector('video');
+    expect(video.src).toBe('https://example.com/video.mp4');
+    expect(video.dataset.hlsManifest).toBeUndefined();
+  });
+
+  it('renders entries with url instead of src', () => {
+    const entries = [
+      { url: 'https://example.com/video.webm' },
+    ];
+    renderPanels(panelsEl, entries, 1, []);
+
+    const video = panelsEl.querySelector('video');
+    expect(video.src).toBe('https://example.com/video.webm');
+  });
+
+  it('prefers src over url when both are present', () => {
+    const entries = [
+      { url: 'https://example.com/page.html', src: 'https://example.com/video.mp4' },
+    ];
+    renderPanels(panelsEl, entries, 1, []);
+
+    const video = panelsEl.querySelector('video');
+    expect(video.src).toBe('https://example.com/video.mp4');
+  });
+
+  it('renders string URLs as standard video entries', () => {
+    // Legacy storage format: plain string URL
+    const entries = ['https://example.com/video.mp4'];
+    renderPanels(panelsEl, entries, 1, []);
+
+    const video = panelsEl.querySelector('video');
+    expect(video.src).toBe('https://example.com/video.mp4');
+    expect(video.dataset.hlsManifest).toBeUndefined();
+  });
+
+  it('sets poster on standard video entries', () => {
+    const entries = [
+      { src: 'https://example.com/video.mp4', poster: 'https://example.com/thumb.jpg' },
+    ];
+    renderPanels(panelsEl, entries, 1, []);
+
+    const video = panelsEl.querySelector('video');
+    expect(video.poster).toBe('https://example.com/thumb.jpg');
+  });
+
+  it('applies video default attributes (autoplay, muted, loop, playsInline)', () => {
+    const entries = [
+      { src: 'https://example.com/video.mp4' },
+    ];
+    renderPanels(panelsEl, entries, 1, []);
+
+    const video = panelsEl.querySelector('video');
+    expect(video.autoplay).toBe(true);
+    expect(video.muted).toBe(true);
+    expect(video.loop).toBe(true);
+    expect(video.playsInline).toBe(true);
+  });
+
+  it('renders mixed HLS and standard entries in same grid', () => {
+    const entries = [
+      { mediaType: 'hls', hlsManifest: 'https://example.com/live.m3u8' },
+      { src: 'https://example.com/recording.mp4' },
+      { mediaType: 'hls', hlsManifest: 'https://example.com/live2.m3u8' },
+      { src: 'https://example.com/recording2.mp4' },
+    ];
+    renderPanels(panelsEl, entries, 2, []);
+
+    const videos = panelsEl.querySelectorAll('video');
+    expect(videos.length).toBe(4);
+
+    // HLS entry
+    expect(videos[0].dataset.hlsManifest).toBe('https://example.com/live.m3u8');
+    expect(videos[0].dataset.mediaType).toBe('hls');
+
+    // Standard entry
+    expect(videos[1].src).toBe('https://example.com/recording.mp4');
+    expect(videos[1].dataset.hlsManifest).toBeUndefined();
+
+    // HLS entry
+    expect(videos[2].dataset.hlsManifest).toBe('https://example.com/live2.m3u8');
+    expect(videos[2].dataset.mediaType).toBe('hls');
+
+    // Standard entry
+    expect(videos[3].src).toBe('https://example.com/recording2.mp4');
+    expect(videos[3].dataset.hlsManifest).toBeUndefined();
+  });
+
+  it('renders empty panels when fewer entries than grid size', () => {
+    const entries = [
+      { src: 'https://example.com/video.mp4' },
+    ];
+    renderPanels(panelsEl, entries, 2, []);
+
+    const panels = panelsEl.querySelectorAll('.panel');
+    expect(panels.length).toBe(4); // 2x2 grid
+    expect(panels[0].classList.contains('empty')).toBe(false);
+    expect(panels[1].classList.contains('empty')).toBe(true);
+    expect(panels[2].classList.contains('empty')).toBe(true);
+    expect(panels[3].classList.contains('empty')).toBe(true);
+  });
+
+  it('applies correct grid CSS for NxN layout', () => {
+    renderPanels(panelsEl, [], 3, []);
+    expect(panelsEl.style.gridTemplateColumns).toBe('repeat(3, 1fr)');
+    expect(panelsEl.style.gridTemplateRows).toBe('repeat(3, 1fr)');
+  });
+});
+
+describe('Edge cases — invalid manifests, missing fields, unsupported browsers', () => {
+  let { panelsEl } = mountViewerDOM();
+
+  beforeEach(() => {
+    const fresh = mountViewerDOM();
+    panelsEl = fresh.panelsEl;
+  });
+
+  it('handles HLS entry with empty hlsManifest string', () => {
+    // mediaType is 'hls' but hlsManifest is an empty string — should fall through to direct src
+    const entries = [
+      { mediaType: 'hls', hlsManifest: '', src: 'https://example.com/fallback.mp4' },
+    ];
+    renderPanels(panelsEl, entries, 1, []);
+
+    const video = panelsEl.querySelector('video');
+    // Empty hlsManifest is falsy, so the else branch runs
+    expect(video.src).toBe('https://example.com/fallback.mp4');
+    expect(video.dataset.hlsManifest).toBeUndefined();
+  });
+
+  it('handles HLS entry with missing hlsManifest', () => {
+    const entries = [
+      { mediaType: 'hls', src: 'https://example.com/video.mp4' },
+    ];
+    renderPanels(panelsEl, entries, 1, []);
+
+    const video = panelsEl.querySelector('video');
+    expect(video.src).toBe('https://example.com/video.mp4');
+  });
+
+  it('handles empty src for non-HLS entry', () => {
+    const entries = [
+      { mediaType: 'video', src: '', url: '' },
+    ];
+    renderPanels(panelsEl, entries, 1, []);
+
+    const video = panelsEl.querySelector('video');
+    // JSDOM resolves empty src to the document base URL; check the raw attribute
+    expect(video.getAttribute('src')).toBe('');
+  });
+
+  it('handles null poster gracefully', () => {
+    const entries = [
+      { src: 'https://example.com/video.mp4', poster: null },
+    ];
+    renderPanels(panelsEl, entries, 1, []);
+
+    const video = panelsEl.querySelector('video');
+    // null poster should not crash; poster attribute defaults to ''
+    expect(video.poster).toBe('');
+  });
+
+  it('handles undefined entry fields without crashing', () => {
+    const entries = [
+      {},
+    ];
+    renderPanels(panelsEl, entries, 1, []);
+
+    const video = panelsEl.querySelector('video');
+    expect(video).not.toBeNull();
+    // JSDOM resolves empty src to base URL; check raw attribute
+    expect(video.getAttribute('src')).toBe('');
+  });
+
+  it('handles null entry in the array', () => {
+    const entries = [null];
+    renderPanels(panelsEl, entries, 1, []);
+
+    const panels = panelsEl.querySelectorAll('.panel');
+    expect(panels[0].classList.contains('empty')).toBe(true);
+  });
+
+  it('handles malformed manifest URL (not .m3u8)', () => {
+    // Viewer doesn't validate manifest URL format — that's hls.js job
+    const entries = [
+      { mediaType: 'hls', hlsManifest: 'https://example.com/invalid-manifest' },
+    ];
+    renderPanels(panelsEl, entries, 1, []);
+
+    const video = panelsEl.querySelector('video');
+    expect(video.dataset.hlsManifest).toBe('https://example.com/invalid-manifest');
+    expect(video.dataset.mediaType).toBe('hls');
+  });
+
+  it('handles HTTP manifest URL (non-HTTPS)', () => {
+    const entries = [
+      { mediaType: 'hls', hlsManifest: 'http://example.com/stream.m3u8' },
+    ];
+    renderPanels(panelsEl, entries, 1, []);
+
+    const video = panelsEl.querySelector('video');
+    expect(video.dataset.hlsManifest).toBe('http://example.com/stream.m3u8');
+  });
+
+  it('handles extremely long manifest URL', () => {
+    const longUrl = 'https://example.com/stream.m3u8?' + 'x='.repeat(1000);
+    const entries = [
+      { mediaType: 'hls', hlsManifest: longUrl },
+    ];
+    renderPanels(panelsEl, entries, 1, []);
+
+    const video = panelsEl.querySelector('video');
+    expect(video.dataset.hlsManifest).toBe(longUrl);
+  });
+
+  it('falls back to url when src is missing for standard entries', () => {
+    const entries = [
+      { url: 'https://example.com/video.mp4' },
+    ];
+    renderPanels(panelsEl, entries, 1, []);
+
+    const video = panelsEl.querySelector('video');
+    expect(video.src).toBe('https://example.com/video.mp4');
+  });
+
+  it('renders panel without label when tags array is shorter than entries', () => {
+    const entries = [
+      { src: 'https://example.com/video.mp4' },
+      { src: 'https://example.com/video2.mp4' },
+    ];
+    renderPanels(panelsEl, entries, 2, ['First Stream']);
+
+    const videos = panelsEl.querySelectorAll('video');
+    const labels = panelsEl.querySelectorAll('.panel-label');
+    expect(videos.length).toBe(2);
+    expect(labels.length).toBe(1); // only first entry has a label
+  });
+});
+
+describe('Browser HLS support detection (conceptual)', () => {
+  /*
+   * These tests verify the decision logic that determines whether
+   * hls.js should be loaded or native playback used.
+   *
+   * Safari has native HLS support (canPlayType returns something
+   * non-empty for 'application/x-mpegURL'). Other browsers need hls.js.
+   */
+
+  it('identifies native HLS support via canPlayType', () => {
+    // Detection function: same logic the viewer should use
+    const detectHlsSupport = (videoEl) => {
+      return typeof videoEl.canPlayType === 'function' &&
+             videoEl.canPlayType('application/x-mpegURL') !== '';
+    };
+
+    const { document: doc } = mountViewerDOM();
+    const video = doc.createElement('video');
+    // JSDOM video elements don't support canPlayType for HLS, returns ''
+    expect(detectHlsSupport(video)).toBe(false); // JSDOM behaves like a non-Safari browser
+
+    // Simulate Safari: canPlayType returns 'probably' for HLS
+    const safariVideo = Object.assign(doc.createElement('video'), {
+      canPlayType: (type) => type === 'application/x-mpegURL' ? 'probably' : '',
+    });
+    expect(detectHlsSupport(safariVideo)).toBe(true);
+  });
+
+  it('uses hls.js when native HLS support is absent', () => {
+    const { document: doc } = mountViewerDOM();
+    const video = doc.createElement('video');
+
+    // Detection function: same logic the viewer should use
+    const supportsNativeHls = (el) => {
+      return typeof el.canPlayType === 'function' &&
+             el.canPlayType('application/x-mpegURL') !== '';
+    };
+
+    // On non-Safari browsers, hls.js is required
+    const needsHlsJs = !supportsNativeHls(video);
+    expect(needsHlsJs).toBe(true);
+  });
+
+  it('skips hls.js when native HLS support is present (Safari simulation)', () => {
+    // Simulate Safari video element
+    const safariVideo = {
+      canPlayType: (type) => type === 'application/x-mpegURL' ? 'probably' : '',
+    };
+
+    const supportsNativeHls = (el) => {
+      return typeof el.canPlayType === 'function' &&
+             el.canPlayType('application/x-mpegURL') !== '';
+    };
+
+    const needsHlsJs = !supportsNativeHls(safariVideo);
+    expect(needsHlsJs).toBe(false); // Safari doesn't need hls.js
+  });
+
+  it('gracefully handles missing canPlayType method', () => {
+    const brokenVideo = {};
+    const supportsNativeHls = (el) => {
+      return typeof el.canPlayType === 'function' &&
+             el.canPlayType('application/x-mpegURL') !== '';
+    };
+    // Should not throw
+    expect(() => supportsNativeHls(brokenVideo)).not.toThrow();
+    expect(supportsNativeHls(brokenVideo)).toBe(false);
+  });
+});
+
+/* ========================================================================== */
+/* Fragmented playback tracking — PanelState lifecycle                         */
+/* ========================================================================== */
+
+function createPanelState() {
+  return {
+    phase: 'idle',
+    segmentsLoaded: 0,
+    segmentsFailed: 0,
+    level: -1,
+    levelLabel: '?x?',
+    bufferedAhead: 0,
+    fpsDropCount: 0,
+    lastEvent: 'none',
+    lastActivity: 0,
+    errorMessage: null,
+    currentTime: 0,
+    duration: 0,
+  };
+}
+
+describe('Fragmented playback tracking — PanelState lifecycle', () => {
+  it('starts in idle phase with zeroed counters', () => {
+    const state = createPanelState();
+    expect(state.phase).toBe('idle');
+    expect(state.segmentsLoaded).toBe(0);
+    expect(state.segmentsFailed).toBe(0);
+    expect(state.level).toBe(-1);
+    expect(state.levelLabel).toBe('?x?');
+    expect(state.bufferedAhead).toBe(0);
+    expect(state.fpsDropCount).toBe(0);
+    expect(state.errorMessage).toBeNull();
+    expect(state.currentTime).toBe(0);
+    expect(state.duration).toBe(0);
+  });
+
+  it('tracks fragment loading count on FRAG_LOADED events', () => {
+    const state = createPanelState();
+    state.segmentsLoaded += 3;
+    state.lastEvent = 'FRAG_LOADED';
+    expect(state.segmentsLoaded).toBe(3);
+    expect(state.lastEvent).toBe('FRAG_LOADED');
+  });
+
+  it('tracks segment failures separately from loads', () => {
+    const state = createPanelState();
+    state.segmentsLoaded += 2;
+    state.segmentsFailed++;
+    expect(state.segmentsLoaded).toBe(2);
+    expect(state.segmentsFailed).toBe(1);
+  });
+
+  it('tracks quality level switches', () => {
+    const state = createPanelState();
+    state.level = 2;
+    state.levelLabel = '1280x720';
+    state.lastEvent = 'LEVEL_SWITCHED';
+    expect(state.level).toBe(2);
+    expect(state.levelLabel).toBe('1280x720');
+  });
+
+  it('tracks FPS drops', () => {
+    const state = createPanelState();
+    state.fpsDropCount += 3;
+    expect(state.fpsDropCount).toBe(3);
+  });
+
+  it('tracks playback position via timeupdate simulation', () => {
+    const state = createPanelState();
+    state.currentTime = 10.5;
+    state.duration = 300;
+    expect(state.currentTime).toBe(10.5);
+    expect(state.duration).toBe(300);
+  });
+});
+
+/* ========================================================================== */
+/* Fragmented playback tracking — phase transitions                            */
+/* ========================================================================== */
+
+describe('Fragmented playback tracking — phase transitions', () => {
+  it('transitions: idle -> loading -> buffering -> playing (happy path)', () => {
+    const state = createPanelState();
+    state.phase = 'loading';
+    expect(state.phase).toBe('loading');
+    state.phase = 'buffering';
+    expect(state.phase).toBe('buffering');
+    state.phase = 'playing';
+    expect(state.phase).toBe('playing');
+  });
+
+  it('transitions: playing -> buffering (rebuffering)', () => {
+    const state = createPanelState();
+    state.phase = 'playing';
+    state.phase = 'buffering';
+    expect(state.phase).toBe('buffering');
+    state.phase = 'playing';
+    expect(state.phase).toBe('playing');
+  });
+
+  it('transitions: playing -> error (fatal network error)', () => {
+    const state = createPanelState();
+    state.phase = 'playing';
+    state.phase = 'error';
+    state.errorMessage = 'Network: MANIFEST_LOAD_ERROR';
+    expect(state.phase).toBe('error');
+    expect(state.errorMessage).toContain('MANIFEST_LOAD_ERROR');
+  });
+
+  it('transitions: error cleared on media error recovery', () => {
+    const state = createPanelState();
+    state.phase = 'playing';
+    state.phase = 'buffering';
+    state.errorMessage = 'Media: DECODE_ERROR';
+    state.errorMessage = null;
+    state.phase = 'playing';
+    expect(state.phase).toBe('playing');
+    expect(state.errorMessage).toBeNull();
+  });
+
+  it('BUFFER_RESET zeroes segment counter and buffer', () => {
+    const state = createPanelState();
+    state.segmentsLoaded = 15;
+    state.bufferedAhead = 5.2;
+    state.segmentsLoaded = 0;
+    state.bufferedAhead = 0;
+    expect(state.segmentsLoaded).toBe(0);
+    expect(state.bufferedAhead).toBe(0);
+  });
+});
+
+/* ========================================================================== */
+/* Fragmented playback tracking — buffer health                                */
+/* ========================================================================== */
+
+describe('Fragmented playback tracking — buffer health', () => {
+  function getBufferedAhead(bufferedEnd, currentTime) {
+    if (bufferedEnd <= currentTime) return 0;
+    return bufferedEnd - currentTime;
+  }
+
+  it('computes buffer ahead correctly when playing', () => {
+    expect(getBufferedAhead(20, 5)).toBe(15);
+  });
+
+  it('returns 0 when buffer is behind current position', () => {
+    expect(getBufferedAhead(3, 5)).toBe(0);
+  });
+
+  it('tracks low buffer health (starvation risk)', () => {
+    expect(getBufferedAhead(6.1, 5)).toBeCloseTo(1.1);
+  });
+
+  it('multiple buffer ranges — picks the one ahead of current time', () => {
+    const ranges = [
+      { start: 0, end: 3 },
+      { start: 10, end: 20 },
+      { start: 30, end: 40 },
+    ];
+    let bufferedAhead = 0;
+    for (const r of ranges) {
+      if (r.end > 5) {
+        bufferedAhead = r.end - 5;
+        break;
+      }
+    }
+    expect(bufferedAhead).toBe(15);
+  });
+});
+
+/* ========================================================================== */
+/* Aggregate state rendering — multi-panel dashboard                           */
+/* ========================================================================== */
+
+describe('Aggregate state rendering — multi-panel dashboard', () => {
+  function computeAggregate(states) {
+    let playing = 0, buffering = 0, errors = 0, idle = 0;
+    let totalSegs = 0, totalSegFails = 0;
+    for (const s of states) {
+      switch (s.phase) {
+        case 'playing': playing++; break;
+        case 'buffering': buffering++; break;
+        case 'error': errors++; break;
+        default: idle++; break;
+      }
+      totalSegs += s.segmentsLoaded;
+      totalSegFails += s.segmentsFailed;
+    }
+    let totalBuf = 0;
+    for (const s of states) {
+      if (s.phase === 'playing' || s.phase === 'buffering') {
+        totalBuf += s.bufferedAhead;
+      }
+    }
+    const active = playing + buffering;
+    return { playing, buffering, errors, idle, totalSegs, totalSegFails, totalBuf, active };
+  }
+
+  it('aggregates playing/buffering/error/idle counts correctly', () => {
+    const states = [
+      { ...createPanelState(), phase: 'playing', segmentsLoaded: 10, bufferedAhead: 8 },
+      { ...createPanelState(), phase: 'playing', segmentsLoaded: 12, bufferedAhead: 9 },
+      { ...createPanelState(), phase: 'buffering', segmentsLoaded: 5, bufferedAhead: 2 },
+      { ...createPanelState(), phase: 'error', segmentsLoaded: 3, segmentsFailed: 1 },
+      { ...createPanelState(), phase: 'idle' },
+    ];
+    const agg = computeAggregate(states);
+    expect(agg.playing).toBe(2);
+    expect(agg.buffering).toBe(1);
+    expect(agg.errors).toBe(1);
+    expect(agg.idle).toBe(1);
+  });
+
+  it('sums segments loaded and failed across panels', () => {
+    const states = [
+      { ...createPanelState(), phase: 'playing', segmentsLoaded: 10, segmentsFailed: 1 },
+      { ...createPanelState(), phase: 'playing', segmentsLoaded: 15 },
+      { ...createPanelState(), phase: 'error', segmentsLoaded: 3, segmentsFailed: 2 },
+    ];
+    const agg = computeAggregate(states);
+    expect(agg.totalSegs).toBe(28);
+    expect(agg.totalSegFails).toBe(3);
+  });
+
+  it('computes average buffer for active panels only', () => {
+    const states = [
+      { ...createPanelState(), phase: 'playing', bufferedAhead: 8 },
+      { ...createPanelState(), phase: 'playing', bufferedAhead: 12 },
+      { ...createPanelState(), phase: 'error', bufferedAhead: 0 },
+    ];
+    const agg = computeAggregate(states);
+    expect(agg.active).toBe(2);
+    expect(agg.totalBuf).toBeCloseTo(20);
+    expect(agg.totalBuf / agg.active).toBeCloseTo(10);
+  });
+
+  it('handles all panels in error', () => {
+    const states = [
+      { ...createPanelState(), phase: 'error', segmentsFailed: 3 },
+      { ...createPanelState(), phase: 'error', segmentsFailed: 1 },
+    ];
+    const agg = computeAggregate(states);
+    expect(agg.errors).toBe(2);
+    expect(agg.active).toBe(0);
+  });
+
+  it('empty state — no panels tracked yet', () => {
+    const agg = computeAggregate([]);
+    expect(agg.playing).toBe(0);
+    expect(agg.buffering).toBe(0);
+    expect(agg.errors).toBe(0);
+    expect(agg.idle).toBe(0);
+    expect(agg.totalSegs).toBe(0);
+  });
+});
+
+/* ========================================================================== */
+/* Fragmented playback tracking — hls.js event simulation                      */
+/* ========================================================================== */
+
+describe('Fragmented playback tracking — hls.js event simulation', () => {
+  it('simulates a full HLS playback lifecycle', () => {
+    const state = createPanelState();
+    state.phase = 'loading';
+    state.lastEvent = 'MEDIA_ATTACHED';
+    expect(state.phase).toBe('loading');
+    state.lastEvent = 'MANIFEST_LOADED';
+    state.levelLabel = '1920x1080';
+    state.lastEvent = 'MANIFEST_PARSED';
+    state.level = 0;
+    state.levelLabel = '640x360';
+    state.phase = 'buffering';
+    for (let i = 0; i < 5; i++) state.segmentsLoaded++;
+    state.phase = 'playing';
+    state.bufferedAhead = 8.5;
+    state.currentTime = 5.2;
+    state.duration = 300;
+    state.level = 1;
+    state.levelLabel = '1280x720';
+    expect(state.phase).toBe('playing');
+    expect(state.segmentsLoaded).toBe(5);
+    expect(state.segmentsFailed).toBe(0);
+    expect(state.fpsDropCount).toBe(0);
+    expect(state.errorMessage).toBeNull();
+    expect(state.level).toBe(1);
+  });
+
+  it('simulates degraded playback with FPS drops and seg failures', () => {
+    const state = createPanelState();
+    state.phase = 'playing';
+    state.segmentsLoaded = 3;
+    state.segmentsFailed += 2;
+    state.fpsDropCount += 2;
+    state.level = 0;
+    state.levelLabel = '426x240';
+    expect(state.phase).toBe('playing');
+    expect(state.segmentsFailed).toBe(2);
+    expect(state.fpsDropCount).toBe(2);
+    expect(state.levelLabel).toBe('426x240');
+  });
+
+  it('simulates fatal network error (manifest expired)', () => {
+    const state = createPanelState();
+    state.phase = 'playing';
+    state.segmentsLoaded = 20;
+    state.phase = 'error';
+    state.errorMessage = 'Network: MANIFEST_LOAD_ERROR';
+    expect(state.phase).toBe('error');
+    expect(state.errorMessage).toContain('MANIFEST_LOAD_ERROR');
+    expect(state.segmentsLoaded).toBe(20);
+  });
+
+  it('simulates media error recovery', () => {
+    const state = createPanelState();
+    state.phase = 'playing';
+    state.segmentsLoaded = 10;
+    state.phase = 'buffering';
+    state.errorMessage = 'Media: DECODE_ERROR';
+    state.errorMessage = null;
+    state.phase = 'playing';
+    state.segmentsLoaded++;
+    expect(state.phase).toBe('playing');
+    expect(state.errorMessage).toBeNull();
+    expect(state.segmentsLoaded).toBe(11);
+  });
+});
+
+/* ========================================================================== */
+/* Fragmented playback tracking — video element event wiring                   */
+/* ========================================================================== */
+
+describe('Fragmented playback tracking — video element event wiring', () => {
+  it('video.playing event sets phase to playing', () => {
+    const state = createPanelState();
+    state.phase = 'buffering';
+    state.phase = 'playing';
+    state.lastEvent = 'video.playing';
+    expect(state.phase).toBe('playing');
+    expect(state.lastEvent).toBe('video.playing');
+  });
+
+  it('video.waiting event sets phase to buffering', () => {
+    const state = createPanelState();
+    state.phase = 'playing';
+    state.phase = 'buffering';
+    state.lastEvent = 'video.waiting';
+    expect(state.phase).toBe('buffering');
+  });
+
+  it('video.timeupdate tracks playback position', () => {
+    const state = createPanelState();
+    state.currentTime = 1.0;
+    state.currentTime = 2.0;
+    state.currentTime = 3.0;
+    state.duration = 300;
+    expect(state.currentTime).toBe(3.0);
+    expect(state.duration).toBe(300);
+  });
+
+  it('overlay auto-fade: playing + segments > 3 + buffered > 2s', () => {
+    const state = createPanelState();
+    state.phase = 'playing';
+    state.segmentsLoaded = 4;
+    state.bufferedAhead = 5;
+    const shouldFade = state.phase === 'playing' &&
+      state.segmentsLoaded > 3 && state.bufferedAhead > 2;
+    expect(shouldFade).toBe(true);
+    state.segmentsLoaded = 2;
+    expect(state.phase === 'playing' && state.segmentsLoaded > 3 && state.bufferedAhead > 2).toBe(false);
+  });
+});
+
+/* ========================================================================== */
+/* Fragmented playback tracking — edge cases                                   */
+/* ========================================================================== */
+
+describe('Fragmented playback tracking — edge cases', () => {
+  it('handles live/loop content where duration is Infinity', () => {
+    const state = createPanelState();
+    state.phase = 'playing';
+    state.currentTime = 15.5;
+    state.duration = Infinity;
+    const isLive = state.duration === Infinity || isNaN(state.duration);
+    expect(isLive).toBe(true);
+    expect(state.currentTime).toBe(15.5);
+  });
+
+  it('handles rapid phase oscillation (playing <-> buffering)', () => {
+    const state = createPanelState();
+    state.phase = 'playing';
+    state.phase = 'buffering';
+    state.phase = 'playing';
+    state.phase = 'buffering';
+    state.phase = 'playing';
+    expect(state.phase).toBe('playing');
+  });
+
+  it('handles ABR rapid switching (quality oscillation)', () => {
+    const state = createPanelState();
+    state.level = 3; state.levelLabel = '1920x1080';
+    state.level = 0; state.levelLabel = '426x240';
+    state.level = 2; state.levelLabel = '1280x720';
+    expect(state.level).toBe(2);
+    expect(state.levelLabel).toBe('1280x720');
+  });
+
+  it('empty panelStates map — initial render shows no panels', () => {
+    const panelStates = new Map();
+    let playing = 0, buffering = 0, errors = 0, idle = 0;
+    for (const s of panelStates.values()) {
+      switch (s.phase) {
+        case 'playing': playing++; break;
+        case 'buffering': buffering++; break;
+        case 'error': errors++; break;
+        default: idle++; break;
+      }
+    }
+    expect(playing).toBe(0);
+    expect(buffering).toBe(0);
+    expect(errors).toBe(0);
+    expect(idle).toBe(0);
+  });
+
+  it('aggregateStateDirty flag prevents unnecessary re-renders', () => {
+    let dirty = false;
+    let calls = 0;
+    function render() { if (!dirty) return; dirty = false; calls++; }
+    render();
+    expect(calls).toBe(0);
+    dirty = true;
+    render();
+    expect(calls).toBe(1);
+    render();
+    expect(calls).toBe(1);
+  });
+
+  it('multiple panels trigger dirty flag idempotently', () => {
+    let dirty = false;
+    let calls = 0;
+    function render() { if (!dirty) return; dirty = false; calls++; }
+    dirty = true; dirty = true; dirty = true;
+    render();
+    expect(calls).toBe(1);
+  });
+
+  it('non-HLS video panels are not tracked in panelStates', () => {
+    const isHls = false;
+    const hasPanelState = isHls;
+    expect(hasPanelState).toBe(false);
+  });
+
+  it('buffer timer cleanup: clearInterval called on destroy', () => {
+    let cleared = false;
+    const mockId = 1;
+    const mockClear = (id) => { if (id === mockId) cleared = true; };
+    mockClear(mockId);
+    expect(cleared).toBe(true);
+  });
+});

vite.config.ts

@@ -8,8 +8,8 @@
  */
 import { defineConfig } from 'vite';
 import { resolve } from 'path';
-import { copyFileSync, mkdirSync, writeFileSync } from 'fs';
 import sharp from 'sharp';
+import { copyFileSync, mkdirSync, writeFileSync } from 'fs';
 
 export default defineConfig({
   root: 'src',
@@ -49,14 +49,20 @@ export default defineConfig({
     },
   ],
   build: {
+    target: 'chrome110',
     outDir: '../dist',
-    emptyOutDir: true,
+    emptyOutdir: true,
+    minify: false,
     rollupOptions: {
       input: {
         background: resolve(__dirname, 'src/background/background.js'),
         content: resolve(__dirname, 'src/content/content.js'),
         viewer: resolve(__dirname, 'src/viewer/viewer.html'),
         viewerIndex: resolve(__dirname, 'src/viewer/index.html'),
+        interceptors: resolve(__dirname, 'src/inject/interceptors.js'),
+        // NOTE: hlds is NOT built by Vite — copied from source as pure ES5 to avoid
+        // esbuild injecting arrow functions (Chrome flags these as "ES module content"
+        // in extension URLs, preventing window.Hls registration).
       },
       output: {
         entryFileNames: '[name].js',
@@ -64,5 +70,8 @@ export default defineConfig({
         assetFileNames: '[name][extname]',
       },
     },
+    modulePreload: {
+      polyfill: false,
+    },
   },
 });