Examine source code of PlayZone

{
  "theme": {
    "images": {
      "theme_frame": "pzpersona.jpg"
    },
    "colors": {
      "frame": "#c2c0c0",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "PlayZone",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/f66129ed36fed31e6070a7fa0745bc1d1e46a0d862160acc727901b01f864c2d/http%3A//www.playzone.cz\" rel=\"nofollow\">www.playzone.cz</a>"
}