Examine source code of Battle.net World

{
  "theme": {
    "images": {
      "theme_frame": "battle_net.png"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Battle.net World",
  "manifest_version": 2,
  "description": "<a href=\"https://outgoing.prod.mozaws.net/v1/d6fb58821b18e4e49cb3242e5af3a0a6d2f1782494d02975250936fdd643de5a/http%3A//Battle.net\" rel=\"nofollow\">Battle.net</a> World\n\nCreated by ottang"
}