{
  "prefbar:info": {
    "formatversion": 3
  },
  "prefbar:menu:enabled": {
    "items": [
      "prefbar:button:gfxxrender"
    ]
  },
  "prefbar:button:gfxxrender": {
    "type": "check",
    "label": "GFX",
    "prefstring": "gfx.xrender.enabled",
    "topref": "Boolean(value)",
    "frompref": "Boolean(value)"
  }
}