Examine source code of Waterfalls_

{
  "theme": {
    "images": {
      "theme_frame": "WaterfallsHCustom.jpg"
    },
    "colors": {
      "frame": "#46542e",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Waterfalls_",
  "manifest_version": 2,
  "description": "Designed by MaDonna\n\nMy wallpaper to match is at: <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/eab5b4d888255fdd33ae59cc7fa57d98a977fb5e1eab51e12474dcbff6ee94d6/http%3A//nature.desktopnexus.com/wallpaper/831619/\">http://nature.desktopnexus.com/wallpaper/831619/</a>"
}