Examine source code of sk8 or die

{
  "theme": {
    "images": {
      "theme_frame": "template_firefox.jpg"
    },
    "colors": {
      "frame": "#fff200",
      "tab_background_text": "#fff200"
    }
  },
  "version": "2.0",
  "name": "sk8 or die",
  "manifest_version": 2,
  "description": "skateboarding street art"
}