Examine source code of Old Map 4

{
  "theme": {
    "images": {
      "theme_frame": "OldMap4.jpg"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Old Map 4",
  "manifest_version": 2,
  "description": "vintage, world, antique, art, map, globe. My wallpaper that matches can be found at: <a href=\"https://outgoing.prod.mozaws.net/v1/468184ffdc224af71d2f5c2a5878b4f02f65a8698952891b45eccdf6fbc045aa/http%3A//abstract.desktopnexus.com/wallpaper/614671/\" rel=\"nofollow\">http://abstract.desktopnexus.com/wallpaper/614671/</a>"
}