Examine source code of Udemy Watcher

{
  "manifest_version": 3,
  "name": "__MSG_app_name__",
  "description": "__MSG_app_description__",
  "version": "1.0.0",
  "action": {
    "default_popup": "src/popup/home.html",
    "default_icon": "src/assets/icons/icon48.png",
    "default_title": "__MSG_app_name__"
  },
  "content_scripts": [
    {
      "js": [
        "src/scripts/content.js"
      ],
      "matches": [
        "https://*.udemy.com/course/*/learn/*"
      ]
    }
  ],
  "content_security_policy": {
    "extension_pages": "default-src 'self'"
  },
  "icons": {
    "16": "src/assets/icons/icon16.png",
    "32": "src/assets/icons/icon32.png",
    "48": "src/assets/icons/icon48.png",
    "128": "src/assets/icons/icon128.png"
  },
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "{8dbdb4cd-15d0-4302-ac56-9a91c9a9e047}",
      "strict_min_version": "109.0"
    }
  }
}