Examine source code of Media Extractor Pro

{
  "manifest_version": 2,
  "name": "Media Extractor Pro",
  "version": "4.0",
  "description": "The ultimate media extraction toolkit for Firefox. Detect, preview, and download videos, audio, and HLS/DASH streams from any webpage. Smart deduplication, download queue, hover preview, resolution & duration display, source tracking, batch rename, watch mode, size filter, quality grouping, best-quality download, TS-to-MP4 transmuxing, dark/light theme, blacklist, and export.",
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "48": "icons/icon-48.png",
    "64": "icons/icon-64.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "activeTab",
    "downloads",
    "webRequest",
    "storage",
    "clipboardWrite",
    "tabs",
    "<all_urls>"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "48": "icons/icon-48.png",
      "64": "icons/icon-64.png"
    }
  },
  "background": {
    "scripts": [
      "lib/mux-shim.js",
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle",
      "all_frames": true
    }
  ],
  "options_ui": {
    "page": "options.html",
    "open_in_tab": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f8eb2144-2406-4d97-9969-b724bc40c3c2}"
    }
  }
}