Examine source code of GlobalCash Pro

{
  "manifest_version": 2,
  "name": "GlobalCash Pro",
  "version": "1.0",
  "description": "Real-time currency converter with advanced features",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "permissions": [
    "storage",
    "https://api.exchangerate-api.com/"
  ],
  "browser_action": {
    "default_icon": "icons/icon-48.png",
    "default_popup": "popup.html"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{a3a09f03-3f2a-4306-bf01-89759e719197}"
    }
  }
}