Examine source code of Number Search

{
  "manifest_version": 3,
  "name": "Number Search",
  "version": "1.0",
  "description": "Search for information about numbers.",
  "permissions": [
    "activeTab"
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": "icons/icon-48.png"
  },
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png"
  },
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "123acv@ta88bet.club"
    }
  }
}