Examine source code of USD to ARS Converter

{
  "manifest_version": 2,
  "name": "USD to ARS Converter",
  "version": "1.0",
  "description": "Converts USD to ARS.",
  "permissions": [
    "activeTab",
    "https://api.exchangerate-api.com/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "browser_action": {
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{d7df11e4-04e9-4628-aac5-c2f284bfd121}"
    }
  }
}