Examine source code of JW.org Video Transcript

{
  "manifest_version": 2,
  "name": "JW.org Video Transcript",
  "version": "1.1.3",
  "description": "Display a searchable transcript using VTT subtitles on JW.org videos. What's new: Added mobile support (Android) with a responsive design that adjusts the transcript location to the screen orientation",
  "content_scripts": [
    {
      "matches": [
        "https://www.jw.org/*"
      ],
      "js": [
        "contentScript.js"
      ],
      "run_at": "document_end"
    }
  ],
  "permissions": [
    "activeTab",
    "https://www.jw.org/*",
    "https://*.jw-cdn.org/*"
  ],
  "browser_specific_settings": {
    "gecko_android": {},
    "gecko": {
      "id": "{0e467dbe-2846-4846-9404-3ffed7c5e784}"
    }
  }
}