Examine source code of Custom Aurora Background

{
  "manifest_version": 2,
  "name": "Custom Aurora Background",
  "version": "1.0",
  "description": "Bring the magical beauty of the aurora into your workspace with Custom Aurora Background.",
  "icons": {
    "128": "icon128.png"
  },
  "permissions": [
    "geolocation"
  ],
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{26c267c5-6afa-4a93-81cd-ac7ff5ce8163}"
    }
  }
}