Examine source code of Avatar Nights

{
  "theme": {
    "images": {
      "theme_frame": "1AvatarFirefoxTopBarv2.jpg"
    },
    "colors": {
      "frame": "#aa70e0",
      "tab_background_text": "#a1e5e6"
    }
  },
  "version": "2.0",
  "name": "Avatar Nights",
  "manifest_version": 2,
  "description": "All images belong to the makers of Avatar and are used solely under fair use for entertainment purposes only. They were merely tweaked a little for art purposes. Thanks!"
}