Examine source code of Linux Mint BG

{
  "theme": {
    "images": {
      "theme_frame": "linuxmint.png"
    },
    "colors": {
      "frame": "#b3b3b3",
      "tab_background_text": "#b3b3b3"
    }
  },
  "version": "2.0",
  "name": "Linux Mint BG",
  "manifest_version": 2,
  "description": "Linux Mint BG under GPL. Designed by desertracer001. Wallpaper available at <a href=\"https://outgoing.prod.mozaws.net/v1/db4c781e8807454d239e01007e2e8cd7cf65397fb74dc78ac151d2cd753113f0/http%3A//www.linuxmint.com\" rel=\"nofollow\">www.linuxmint.com</a>    Enjoy!!!"
}