Examine source code of VPN Checker

{
  "manifest_version": 3,
  "name": "__MSG_extName__",
  "description": "__MSG_extDesc__",
  "version": "0.4.1",
  "default_locale": "en",
  "icons": {
    "16": "icons/icon-16.png",
    "32": "icons/icon-32.png",
    "64": "icons/icon-64.png",
    "128": "icons/icon-128.png"
  },
  "action": {
    "default_title": "__MSG_extName__",
    "default_popup": "popup/popup.html",
    "default_icon": {
      "16": "icons/icon-16.png",
      "32": "icons/icon-32.png",
      "64": "icons/icon-64.png",
      "128": "icons/icon-128.png"
    }
  },
  "permissions": [
    "alarms",
    "storage"
  ],
  "host_permissions": [
    "https://ipleak.net/json",
    "https://ipwho.is/",
    "https://ifconfig.co/json",
    "https://ipinfo.io/json",
    "https://api.ipify.org/"
  ],
  "background": {
    "scripts": [
      "bundle/background.bundle.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "vpnchecker1234@monemail.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}