Examine source code of Winter III

{
  "theme": {
    "images": {
      "theme_frame": "winter3HCustom.jpg"
    },
    "colors": {
      "frame": "#b4c4f0",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Winter III",
  "manifest_version": 2,
  "description": "snow, cold, trees, snowing, winter, Christmas, blue, gray, evergreen, My wallpaper to match can be found at: <a href=\"https://outgoing.prod.mozaws.net/v1/84102cc15139b547825a4d0721b91a3ca655466bc668ad757e8a51462cbe9410/http%3A//nature.desktopnexus.com/wallpaper/744459/\" rel=\"nofollow\">http://nature.desktopnexus.com/wallpaper/744459/</a>"
}