Examine source code of FunPay FD

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "FunPay FD",
  "version": "1.0.0",
  "description": "Кастомная тёмная тема FunPay от Золло",
  "content_scripts": [
    {
      "matches": [
        "https://funpay.com/*"
      ],
      "css": [
        "style.css"
      ]
    }
  ]
}