Examine source code of SundownPattern

{
  "theme": {
    "images": {
      "theme_frame": "p_header.jpg"
    },
    "colors": {
      "frame": "#220b75",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "SundownPattern",
  "manifest_version": 2,
  "description": "This persona is based on the digital print \"Sundown Patterns\" by Trubright Digital Art.\n<a href=\"https://outgoing.prod.mozaws.net/v1/3d2375a0b2c85fb9fad326fd9f8760a49d3b89f3b2c370c75b07229fe644f06c/http%3A//www.trubright.com\" rel=\"nofollow\">http://www.trubright.com</a>"
}