Examine source code of Quick Currency Converter

{
  "manifest_version": 2,
  "name": "Quick Currency Converter",
  "version": "1.1",
  "description": "Currency converter with custom new tab",
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png",
    "128": "icons/icon-128.png"
  },
  "permissions": [
    "tabs",
    "search",
    "https://cdn.jsdelivr.net/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "currency.exchange@the4psextensions",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}