Examine source code of YouTube Transcript Copy

{
  "manifest_version": 3,
  "name": "YouTube Transcript Copy",
  "version": "1.8",
  "description": "Copy YouTube subtitles via right-click menu & auto-clean tracking params from copied links",
  "browser_specific_settings": {
    "gecko": {
      "id": "parsers_frailer8k@icloud.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "permissions": [
    "contextMenus"
  ],
  "host_permissions": [
    "https://www.youtube.com/*",
    "https://*.youtube.com/*"
  ],
  "background": {
    "service_worker": "background.js",
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://www.youtube.com/*",
        "https://youtube.com/*"
      ],
      "js": [
        "url-cleaner.js",
        "inject.js"
      ],
      "run_at": "document_start",
      "world": "MAIN"
    },
    {
      "matches": [
        "https://www.youtube.com/*",
        "https://youtube.com/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ]
}