Examine source code of Undzen Yandex

{
  "manifest_version": 2,
  "name": "Undzen Yandex",
  "version": "1.1",
  "description": "Adds a redirect from yandex.ru to Yandex home page",
  "icons": {
    "48": "icons/48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "https://yandex.ru/",
        "https://yandex.ru/?*",
        "https://dzen.ru/",
        "https://dzen.ru/?*",
        "https://zen.yandex.ru/"
      ],
      "run_at": "document_end",
      "js": [
        "undzen.js"
      ]
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{1949cda1-3ede-4149-b04c-a8776a7277b0}"
    }
  }
}