Examine source code of goSupermodel

{
  "theme": {
    "images": {
      "theme_frame": "prs.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "goSupermodel",
  "manifest_version": 2,
  "description": "for <a href=\"https://outgoing.prod.mozaws.net/v1/21c9b705ea2045a2a0045e0d395311a3cc4cc661cba1277e11c11fb45a52bfcd/http%3A//goSupermodel.com\" rel=\"nofollow\">goSupermodel.com</a> :)"
}