Examine source code of FireFoxHound Urban

{
  "theme": {
    "images": {
      "theme_frame": "firefoxhound2-head.jpg"
    },
    "colors": {
      "frame": "#cccccc",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "FireFoxHound Urban",
  "manifest_version": 2,
  "description": "Another Fox Hound style persona, this time with an urban theme.   "
}