Examine source code of Winter Begins

{
  "theme": {
    "images": {
      "theme_frame": "WinterBeginsH.jpg"
    },
    "colors": {
      "frame": "#85cc97",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Winter Begins",
  "manifest_version": 2,
  "description": "trees, snow, cold, mountains, winter, green, transparent, subdued, The wallpaper to match this can be found at: <a href=\"https://outgoing.prod.mozaws.net/v1/8eaf5236fdba71389f97835996af7f46454879b5e66090ad958eb3fcdfc473c1/http%3A//nature.desktopnexus.com/wallpaper/752831/\" rel=\"nofollow\">http://nature.desktopnexus.com/wallpaper/752831/</a>"
}