Examine source code of YT Tab Controller

{
  "manifest_version": 2,
  "name": "YT Controller",
  "version": "1.2.0",
  "description": "Right-click the toolbar icon to play/pause any YouTube tab. Toolbar icon also toggles playback.",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/icon-play-48.png"
    },
    "default_title": "YT Controller — Click to Play/Pause"
  },
  "permissions": [
    "tabs",
    "contextMenus"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "content_scripts": [
    {
      "matches": [
        "*://*.youtube.com/*"
      ],
      "js": [
        "content.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "yt-controller@extension",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}