Examine source code of Magic Homepage

{
  "description": "Красивый фон новой вкладки и домашней страницы любимого браузера",
  "manifest_version": 2,
  "name": "Magic Homepage",
  "version": "4.0",
  "icons": {
    "48": "icons/share-48.png",
    "96": "icons/share-96.png",
    "128": "icons/share-128.png"
  },
  "browser_action": {
    "default_icon": {
      "48": "icons/share-48.png",
      "96": "icons/share-96.png",
      "128": "icons/share-128.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "andreslav.k.v@mail.ru"
    }
  },
  "options_ui": {
    "page": "options.html"
  },
  "chrome_url_overrides": {
    "newtab": "app.html"
  }
}