Examine source code of Currency Converter

{
  "manifest_version": 3,
  "name": "Currency Converter",
  "description": "Convert currencies quickly with live exchange rates.",
  "version": "1.0.0",
  "action": {
    "default_title": "Currency Converter",
    "default_popup": "popup.html"
  },
  "permissions": [
    "https://open.er-api.com/*",
    "storage"
  ],
  "host_permissions": [
    "https://open.er-api.com/*"
  ],
  "icons": {
    "16": "icons/icon16.png",
    "32": "icons/icon32.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  },
  "default_locale": "en",
  "browser_specific_settings": {
    "gecko": {
      "id": "currency-converter@kienthucso.com",
      "strict_min_version": "109.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}