Examine source code of GSTwin.com

{
  "theme": {
    "images": {
      "theme_frame": "Persona_gstwin.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#a89b9b"
    }
  },
  "version": "2.0",
  "name": "GSTwin.com",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/b3e50ea973a857c80764be6799400c1f7fe68aa5ae58499cdd5db42cc1de4a8f/http%3A//GSTwins.com\" rel=\"nofollow\">GSTwins.com</a> board"
}