Examine source code of Firefox Ubuntufied !

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#dd4814",
      "tab_background_text": "#fffff9"
    }
  },
  "version": "2.0",
  "name": "Firefox Ubuntufied !",
  "manifest_version": 2,
  "description": "This is the theme for Firefox lovers of Ubuntu Fans ! Lets spread Humanity and Ubuntu  . . !! OMG !\n\nNote: The preview of this theme may look partial since only the top right corner of the theme will be displayed in browser. When you install it, it will fill the whole area of your Firefox browser !"
}