Examine source code of Basic Bookmark Homepage

{
  "name": "Basic Bookmark Homepage",
  "version": "5.0.0",
  "description": "A Basic Bookmark Homepage",
  "manifest_version": 3,
  "permissions": [
    "bookmarks",
    "storage"
  ],
  "icons": {
    "16": "assets/icon16.png",
    "32": "assets/icon32.png",
    "48": "assets/icon48.png",
    "128": "assets/icon128.png"
  },
  "action": {
    "default_icon": {
      "16": "assets/icon16.png",
      "32": "assets/icon32.png",
      "48": "assets/icon48.png",
      "128": "assets/icon128.png"
    }
  },
  "chrome_url_overrides": {
    "newtab": "main.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "k4514793@gmail.com"
    }
  }
}