Examine source code of YouTube Playlist Tools

{
  "manifest_version": 3,
  "name": "YouTube Playlist Tools",
  "version": "1.4.5",
  "description": "Add current YouTube video to specified playlists.",
  "permissions": [
    "activeTab",
    "storage",
    "identity",
    "scripting"
  ],
  "background": {
    "scripts": [
      "src/background.js"
    ]
  },
  "action": {
    "default_popup": "src/popup/popup.html"
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "exclude_matches": [
        "*://*.music.youtube.com/*"
      ],
      "js": [
        "src/content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "options_ui": {
    "page": "src/options/options.html"
  },
  "icons": {
    "128": "icons/icon128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{cc70cd21-2cc6-444b-bd89-496909346091}",
      "strict_min_version": "125.0"
    }
  }
}