Examine source code of ZenStart

{
  "name": "ZenStart",
  "description": "A browser extension that replaces the new tab page with a beautiful and customizable dashboard.",
  "version": "1.0.0",
  "manifest_version": 3,
  "action": {
    "default_title": "ZenStart",
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "icons": {
    "16": "icon-16.png",
    "48": "icon-48.png",
    "128": "icon-128.png"
  },
  "permissions": [
    "storage",
    "activeTab"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "rdmnr@protonmail.com"
    }
  }
}