Examine source code of Sunset Flat Material

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#525252",
      "tab_background_text": "#ebebeb"
    }
  },
  "version": "2.0",
  "name": "Sunset Flat Material",
  "manifest_version": 2,
  "description": "ORIGINAL IMAGE:\n<a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/190657b2dbf8290de34dd95b03f50f7e0a5b783a7957ff046d32c6688ff1a7dd/http%3A//7-themes.com/collections/minimalist-wallpapers/4506962/\">http://7-themes.com/collections/minimalist-wallpapers/4506962/</a>"
}