Examine source code of Simple Start

{
  "manifest_version": 2,
  "name": "Simple Start",
  "description": "Highly customizable new tab extension with categorized bookmark groups",
  "version": "2.3.1",
  "icons": {
    "16": "icon-16.png",
    "32": "icon-32.png",
    "48": "icon-48.png",
    "96": "icon-96.png"
  },
  "permissions": [
    "bookmarks",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{6938c509-173c-416e-b440-69a7218af76f}",
      "strict_min_version": "58.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "options_ui": {
    "open_in_tab": true,
    "page": "options.html"
  }
}