Examine source code of Bookshelf-newtab

{
  "manifest_version": 3,
  "name": "Bookshelf-newtab",
  "version": "2.2.0",
  "description": "Minimalist new tab page",
  "developer": {
    "name": "Kaciras",
    "url": "https://github.com/Kaciras/bookshelf"
  },
  "default_locale": "en",
  "icons": {
    "48": "icon.svg",
    "96": "icon.svg"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{D62F4BEC-4816-4E72-AD12-FD2DC48E7A6B}",
      "strict_min_version": "117.0"
    }
  },
  "permissions": [
    "topSites",
    "storage"
  ],
  "host_permissions": [
    "*://*/*"
  ],
  "chrome_url_overrides": {
    "newtab": "new-tab.html"
  }
}