Examine source code of WoW - Art beta

{
  "theme": {
    "images": {
      "theme_frame": "Persona_Header_LABS.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "WoW - Art beta",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/24d9c640f091f1ec1e82f62b77274ff38c380a0067a58f1e58f5d84ae12c8439/http%3A//wow-art.ucoz.com/\" rel=\"nofollow\">http://wow-art.ucoz.com/</a>"
}