Examine source code of Clean Imantu

{
  "theme": {
    "images": {
      "theme_frame": "dark005.jpg"
    },
    "colors": {
      "frame": "#0088ff",
      "tab_background_text": "#cccccc"
    }
  },
  "version": "2.0",
  "name": "Clean Imantu",
  "manifest_version": 2,
  "description": "A clean dark background that melds nicely with the Firefox layout."
}