Examine source code of UrbanTerror urt

{
  "theme": {
    "images": {
      "theme_frame": "persona1b.jpg"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "UrbanTerror urt",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/1f31824a2adedb026bb37169df1f0afff2bb7825034127af25dcc04366f0f441/http%3A//www.urbanterror.info/\" rel=\"nofollow\">http://www.urbanterror.info/</a>"
}