Examine source code of Houndstooth Tux

{
  "theme": {
    "images": {
      "theme_frame": "tuxfirefox.jpg"
    },
    "colors": {
      "frame": "#bdbdbd",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Houndstooth Tux",
  "manifest_version": 2,
  "description": "Linux Tux Crystal on a houndstooth background.    "
}