Examine source code of Radio SubStil

{
  "theme": {
    "images": {
      "theme_frame": "Untitled-1.png"
    },
    "colors": {
      "frame": "#030303",
      "tab_background_text": "#0a0909"
    }
  },
  "version": "2.0",
  "name": "Radio SubStil",
  "manifest_version": 2,
  "description": "radio substil <a href=\"https://outgoing.prod.mozaws.net/v1/42d70e224c9f780f92f207d002c1c5fc140722f147a1b481ec372f03ffa01c10/http%3A//www.substil.net\" rel=\"nofollow\">www.substil.net</a>"
}