Examine source code of YT Grabber

{
  "manifest_version": 2,
  "name": "YT Grabber",
  "version": "1.1.0",
  "description": "Adds a Download button to YouTube, YouTube Music, and TikTok videos and playlists, sent straight to your local downloader app.",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "permissions": [
    "http://127.0.0.1/*"
  ],
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*",
        "https://m.youtube.com/*",
        "https://music.youtube.com/*",
        "https://www.tiktok.com/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "content.css"
      ],
      "run_at": "document_idle",
      "all_frames": false
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "yt-grabber@local.app",
      "strict_min_version": "78.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}