Examine source code of My IP

{
  "manifest_version": 3,
  "name": "My IP",
  "version": "4.1",
  "description": "Displays your current IP address with copy and download options.",
  "action": {
    "default_popup": "index.html"
  },
  "icons": {
    "500": "IMG/IP.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{424485ef-8107-4935-956a-f69b2b0e29d5}"
    }
  }
}