Examine source code of Subsim1

{
  "theme": {
    "images": {
      "theme_frame": "SubSim.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#09090a"
    }
  },
  "version": "2.0",
  "name": "Subsim1",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/d07f12f37bfdf27a804bff2877f330bba8ff0a021287a146e6d9e3e6b62c4e9e/http%3A//Subsim.com\" rel=\"nofollow\">Subsim.com</a>, support and modding for Silent Hunter series and more."
}