Examine source code of New Tab Graph

{
  "manifest_version": 2,
  "name": "New Tab Graph",
  "version": "1.2",
  "description": "Interactive graph-based bookmarks on the new tab page.",
  "permissions": [
    "storage",
    "<all_urls>"
  ],
  "chrome_url_overrides": {
    "newtab": "newtab.html"
  },
  "options_ui": {
    "page": "settings.html",
    "open_in_tab": true
  },
  "icons": {
    "48": "icons/icon.svg",
    "96": "icons/icon.svg",
    "128": "icons/icon.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b232441a-6bca-4cd9-ab62-985983e6a590}",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}