Examine source code of mack.ch

{
  "theme": {
    "images": {
      "theme_frame": "1.png"
    },
    "colors": {
      "frame": "#e8dfdf",
      "tab_background_text": "#e8dfdf"
    }
  },
  "version": "2.0",
  "name": "mack.ch",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/24f130e96e011ff009d2ae6efee36dddb89264c45c183fda39292bbd0630b350/http%3A//mack.ch\" rel=\"nofollow\">mack.ch</a>"
}