Examine source code of Minecraft - Simple

{
  "theme": {
    "images": {
      "theme_frame": "MinecraftHeader.jpg"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#000"
    }
  },
  "version": "2.0",
  "name": "Minecraft - Simple",
  "manifest_version": 2,
  "description": "A simple Minecraft persona. This was made with my browser in mind and thus probably doesn't work to well for others.\n\nPlay Minecraft at <a href=\"https://outgoing.prod.mozaws.net/v1/8ffceb1316996daadd98507da851e097ee0c9cc9de5ef97bf144442c5edc3102/http%3A//minecraft.net\" rel=\"nofollow\">minecraft.net</a> :D it is loads of fun!"
}