Examine source code of Subtitles Translator

{
  "manifest_version": 2,
  "name": "Subtitles Translator",
  "version": "1.0",
  "description": "Automatically translate subtitles on video platforms.",
  "icons": {
    "48": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "permissions": [
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{31b8af3d-ae50-4560-878b-50f098fedacd}"
    }
  }
}