Examine source code of Curren Convrter

{
  "manifest_version": 3,
  "name": "Currency Converter",
  "version": "1.0",
  "description": "Addon Firefox MV3 giúp quy đổi tiền tệ nhanh bằng API exchangerate.host.",
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "icons/icon16.png",
      "48": "icons/icon48.png",
      "128": "icons/icon128.png"
    }
  },
  "permissions": [
    "storage"
  ],
  "host_permissions": [
    "https://api.exchangerate.host/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "currencyconverter@example.com",
      "strict_min_version": "109.0"
    }
  }
}