Examine source code of Ubuntu Ultimate

{
  "theme": {
    "images": {
      "theme_frame": "Ultimate-Edition-FireFoxSkin.png"
    },
    "colors": {
      "frame": "#f00e0e",
      "tab_background_text": "#f70a0a"
    }
  },
  "version": "2.0",
  "name": "Ubuntu Ultimate",
  "manifest_version": 2,
  "description": "This Firefox Persona was designed to be used with Firefox for Ubuntu Ultimate Edition"
}