Examine source code of firefox xtreme

{
  "theme": {
    "images": {
      "theme_frame": "mac-os-x-leopard-background_green.jpg"
    },
    "colors": {
      "frame": "#e6ed5c",
      "tab_background_text": "#261f1f"
    }
  },
  "version": "2.0",
  "name": "firefox xtreme",
  "manifest_version": 2,
  "description": "An elegant yet awesome theme that will probably take long before you tire"
}