Examine source code of IP Viewer

{
  "manifest_version": 2,
  "name": "IP Viewer",
  "version": "1.0",
  "description": "View and copy your public IP address with a single click.",
  "permissions": [
    "<all_urls>",
    "clipboardWrite",
    "storage"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icon.png"
    }
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{af79c6ce-da3d-4bca-ada1-6d1e036507d1}"
    }
  }
}