Examine source code of New-Browsertab

{
  "manifest_version": 2,
  "name": "New-Tab",
  "version": "2.4",
  "description": "Opens a clean glassmorphism Startpage when a new tab gets created",
  "chrome_url_overrides": {
    "newtab": "index.html"
  },
  "icons": {
    "16": "icons/icon-16.png",
    "48": "icons/icon-48.png",
    "128": "icons/icon-128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "sebastian@one-auth.net",
      "strict_min_version": "58.0"
    }
  }
}