Examine source code of MoneyRTConvert

{
  "manifest_version": 2,
  "name": "MoneyRTConvert",
  "version": "1.0",
  "description": "Real-time currency converter for global travelers and traders. Supports major world country currencies with instant updates. ",
  "icons": {
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "browser_action": {
    "default_popup": "index.html",
    "default_icon": "icon48.png"
  },
  "permissions": [
    "https://cdn.jsdelivr.net/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{fc90aac4-dbb5-44b6-a20d-b226d5b7c659}"
    }
  }
}