Examine source code of Smoker

{
  "theme": {
    "images": {
      "theme_frame": "working.jpg"
    },
    "colors": {
      "frame": "#b3b3b3",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Smoker",
  "manifest_version": 2,
  "description": "A simple blue-tinged persona skin for Firefox. With a sort of canine-like figure having a smoke."
}