Examine source code of Gerberas Wild by MaDonna

{
  "theme": {
    "images": {
      "theme_frame": "GerberasintheWildH-CopyCustom.jpg"
    },
    "colors": {
      "frame": "#a5fee3",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Gerberas Wild by MaDonna",
  "manifest_version": 2,
  "description": "My wallpaper to match is at: <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/51039666bea1af8f169e416ec9873fa3a0c2e71738af5139e7b885fa7e5dc71a/http%3A//nature.desktopnexus.com/wallpaper/987213/\">http://nature.desktopnexus.com/wallpaper/987213/</a>"
}