Examine source code of Lamborghini background

{
  "manifest_version": 2,
  "name": "Lamborghini background",
  "description": "Bring the elegance and power of Lamborghini to your browser.",
  "version": "1.0",
  "offline_enabled": true,
  "icons": {
    "128": "icons/128.png"
  },
  "background": {
    "scripts": [
      "sw.js"
    ],
    "persistent": false
  },
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "permissions": [
    "storage"
  ],
  "externally_connectable": {
    "matches": [
      "*://www.google.com/*"
    ]
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{508bcd90-087c-456b-9440-3016807bec90}"
    }
  }
}