Examine source code of Softly...

{
  "theme": {
    "images": {
      "theme_frame": "SoftlyH.jpg"
    },
    "colors": {
      "frame": "#030303",
      "tab_background_text": "#050505"
    }
  },
  "version": "2.0",
  "name": "Softly...",
  "manifest_version": 2,
  "description": "water, bush, light, lamp, snail, flowers, beige, bisque, sand, bubbles, butterfly, My wallpaper to match can be found at: <a href=\"https://outgoing.prod.mozaws.net/v1/b4e06750c096d07be8ce3dc9d328f463a22dced3049ac8ea0899e58ca8ecef9d/http%3A//nature.desktopnexus.com/wallpaper/671101/\" rel=\"nofollow\">http://nature.desktopnexus.com/wallpaper/671101/</a>"
}