Examine source code of VPN Frontier

{
  "manifest_version": 3,
  "name": "VPN Frontier",
  "version": "6.1.0",
  "description": "Block Russian domains when your IP is outside Russia. Protect yourself — turn off your VPN.",
  "browser_specific_settings": {
    "gecko": {
      "id": "vpn-frontier@example.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "disclosure_content": "VPN Frontier does not collect any user data. IP geolocation checks are sent directly from your browser to third-party APIs you select. Results are stored locally."
      }
    }
  },
  "permissions": [
    "storage",
    "declarativeNetRequest",
    "alarms",
    "notifications",
    "webNavigation",
    "tabs",
    "contextMenus"
  ],
  "host_permissions": [
    "https://ipapi.co/*",
    "https://ifconfig.co/*",
    "https://ipinfo.io/*",
    "https://pro.ip-api.com/*",
    "https://freeipapi.com/*",
    "https://ipwho.is/*",
    "https://api.ipdata.co/*",
    "https://api.ipbase.com/*",
    "https://api.ipgeolocation.io/*",
    "https://api.ip2location.io/*"
  ],
  "background": {
    "scripts": [
      "lang.js",
      "background.js"
    ]
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/globe16.png",
      "48": "icons/globe48.png",
      "128": "icons/globe128.png"
    }
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "web_accessible_resources": [
    {
      "resources": [
        "blocked.html",
        "blocked.js",
        "lang.js",
        "options.html",
        "options.js"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "icons": {
    "16": "icons/globe16.png",
    "48": "icons/globe48.png",
    "128": "icons/globe128.png"
  }
}