Examine source code of Open Comments

{
  "manifest_version": 3,
  "name": "Open Comments",
  "version": "1.4.0",
  "description": "Comments for the whole internet.",
  "browser_specific_settings": {
    "gecko": {
      "id": "security@open-comments.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "authenticationInfo"
        ]
      }
    }
  },
  "permissions": [
    "activeTab",
    "storage",
    "tabs",
    "cookies",
    "alarms",
    "identity"
  ],
  "host_permissions": [
    "https://open-comments.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "32": "icons/icon32.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "content_scripts": [
    {
      "matches": [
        "*://www.youtube.com/*",
        "https://youtu.be/*"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "styles.css"
      ],
      "run_at": "document_start"
    }
  ],
  "oauth2": {
    "client_id": "194720297743-rpktirictr46aul5g532taapbhjhp985.apps.googleusercontent.com",
    "scopes": [
      "https://www.googleapis.com/auth/userinfo.email",
      "https://www.googleapis.com/auth/userinfo.profile"
    ]
  }
}