Examine source code of IPLAYCO

{
  "theme": {
    "images": {
      "theme_frame": "firefoxbackground.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "IPLAYCO",
  "manifest_version": 2,
  "description": "Indoor Playgrounds by Iplayco\n<a href=\"https://outgoing.prod.mozaws.net/v1/c969e5a20ce702fca9bde17113d7c9acc464beaa67084b45075ed72059a0d720/http%3A//www.iplayco.com\" rel=\"nofollow\">www.iplayco.com</a>"
}