Examine source code of VirtualTuning.IT

{
  "theme": {
    "images": {
      "theme_frame": "VT-Personal-Firefox-Header.jpg"
    },
    "colors": {
      "frame": "#33ccff",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "VirtualTuning.IT",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/be1a0ad49be1b2a2bdeec92602842db0444dee03b0ceb40d29a6205183a23f84/http%3A//VirtualTuning.IT\" rel=\"nofollow\">VirtualTuning.IT</a> - Official style"
}