Examine source code of Abstract White Mark II

{
  "theme": {
    "images": {
      "theme_frame": "Firefoxabstractblackheader.png"
    },
    "colors": {
      "frame": "#666666",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Abstract White Mark II",
  "manifest_version": 2,
  "description": "Actually a heavily modified screenshot of the pre-release port of Windows Vista's \"Ribbons\" Screensaver. It has been altered heavily to have more contrast and be greyscale. Enjoy!"
}