Examine source code of Android Up In This.

{
  "theme": {
    "images": {
      "theme_frame": "AndroidFireforxPersona.jpg"
    },
    "colors": {
      "frame": "#7d7d7d",
      "tab_background_text": "#49bf00"
    }
  },
  "version": "2.0",
  "name": "Android Up In This.",
  "manifest_version": 2,
  "description": "This is just a simple Android theme I made in Photoshop in an attempt to have a theme where you can see all elements with no toolbars in the browser. \n\n** Designed for use with Firefox 6, no additional toolbars **"
}