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The root cause of repeated 'does not detect any videos' failures was that m3u8DeepProbeFn and scrapeFn were injected via chrome.scripting.executeScript in the isolated world (default). From the isolated world: - window.__goon_plugin_data (set by main-world interceptors) — NOT visible - window.Hls / Hls.cast (page's hls.js) — NOT visible - Player globals (PHPlayer, flowplayer, etc.) — NOT visible - Config globals (__NEXT_DATA__, appData, etc.) — NOT visible Only DOM properties like video._goon_hls_manifest cross the boundary, making the detection pipeline mostly blind on real HLS sites. Fix: set world: 'MAIN' on both executeScript calls so all 6 deep probe strategies and all 5 scrape priorities actually work. Chrome MV3 supports this since Chrome 108; our build targets chrome110.
Goon Plugin
A Chrome extension (Manifest V3) that finds videos on the current page and displays them in a 2x2 grid.
Features
- Click the extension icon → "Find Videos" to scan the current tab for all
<video>elements - Videos are listed in the popup for reference (clickable links, "Copy All URLs" button)
- Click "Open Viewer" to open a new window with videos in a 2x2 grid (autoplay muted)
- Click "Clear" to reset the stored video list
Getting started
# 1. Install deps
npm i
# 2. Run in watch mode
npm run dev
# 3. Build for distribution
npm run build
Loading in Chrome
- Open
chrome://extensions/ - Enable Developer mode (top-right)
- Click Load unpacked → select the project root folder (where
manifest.jsonis located)
Project structure
manifest.json — Extension manifest (MV3)
package.json — Dev tooling (Vite + Vitest + TS)
vite.config.ts — Build config
src/
background/ — Service worker (MV3 background)
content/ — Content script
viewer/ — Popup UI + video viewer
index.html — Popup (Find Videos, Open Viewer buttons)
index.js — Popup logic (scans current tab for videos)
index.css — Popup styles
viewer.html — Viewer page (2x2 video grid in new window)
viewer.js — Viewer logic (renders video panels)
viewer.css — Viewer grid styles
icons/ — Extension icons (place .png files here)
Recommended extensions (VS Code)
- Chrome Extension Developer (extension-list-viewer)
- ESLint
- Prettier
VS Code workspace
Open goon_plugin.code-workspace to get the project with recommended extensions pre-installed.