Examine source code of Icy meltdown

{
  "theme": {
    "images": {
      "theme_frame": "cloudy.png"
    },
    "colors": {
      "frame": "#9bc6cc",
      "tab_background_text": "#0d0101"
    }
  },
  "version": "2.0",
  "name": "Icy meltdown",
  "manifest_version": 2,
  "description": "the original picture is the surface of our frozen pool now finally melting, hence the name. Then fooling around with a paint-program until it was foo-bar'd :)"
}