Examine source code of Toolbar Dial

{
  "manifest_version": 2,
  "name": "Toolbar Dial",
  "version": "2.7.1",
  "permissions": [
    "bookmarks",
    "storage"
  ],
  "description": "Toolbar Dial is an extension for modern browsers that replaces the new tab page with a colorful grid of your bookmarks and folders.",
  "chrome_settings_overrides": {
    "homepage": "index.html"
  },
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "icons": {
    "16": "icons/16.svg",
    "32": "icons/32.svg",
    "48": "icons/48.svg",
    "64": "icons/64.svg",
    "96": "icons/96.svg",
    "128": "icons/128.svg",
    "256": "icons/256.svg",
    "512": "icons/512.svg",
    "1024": "icons/1024.svg"
  },
  "author": "Lucas Everett",
  "homepage_url": "https://toolbardial.com",
  "browser_specific_settings": {
    "gecko": {
      "id": "{f558e0b7-ded4-4803-a06f-3dcc5a8cc37e}"
    }
  }
}