Examine source code of Another Simple Startpage

{
  "name": "Another Simple Startpage",
  "description": "Customize it to quickly access your favorite websites and stay organized.",
  "version": "1.3",
  "manifest_version": 2,
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "icons": {
    "128": "bookmark.png"
  },
  "permissions": [
    "tabs"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{8cac76c1-f9be-4364-ac3b-6761aa195e0d}"
    }
  }
}