Examine source code of Custom new tab

{
  "manifest_version": 3,
  "name": "Custom new tab",
  "short_name": "custom-new-tab",
  "version": "1.0.1",
  "description": "Custom new tab page with minimal implementation and permissions.",
  "permissions": [
    "storage"
  ],
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "options_ui": {
    "page": "options.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "custom-new-tab@csutorasa.github.com",
      "strict_min_version": "109.0"
    }
  },
  "minimum_chrome_version": "88"
}