Examine source code of Fractal shells

{
  "theme": {
    "images": {
      "theme_frame": "firefoxHMhead1.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#172608"
    }
  },
  "version": "2.0",
  "name": "Fractal shells",
  "manifest_version": 2,
  "description": "www.howlingmad.co.za -  T-Shirt and Mug design portal for up and coming South African designers"
}