Examine source code of IceHaus

{
  "theme": {
    "images": {
      "theme_frame": "FF-banner-top.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "IceHaus",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/87e5379f1e637ca58ad57335a74fa1b95b64985561c7b0a24199127e5753ac02/http%3A//IceHaus.de\" rel=\"nofollow\">IceHaus.de</a> Logo"
}