Examine source code of Youtube Playlist Time

{
  "manifest_version": 3,
  "name": "Youtube Playlist Time",
  "version": "1.0",
  "description": "Show youtube playlists total time.",
  "action": {
    "default_popup": "popup.html"
  },
  "permissions": [
    "activeTab"
  ],
  "content_scripts": [
    {
      "js": [
        "assets/content.ts-CN8REKCY.js"
      ],
      "matches": [
        "https://www.youtube.com/*"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{34fed27b-62b8-43f4-a126-6110b2d128eb}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "web_accessible_resources": [
    {
      "matches": [
        "https://www.youtube.com/*"
      ],
      "resources": [
        "assets/content.ts-CN8REKCY.js"
      ]
    }
  ]
}