{
  "prefbar:info": {
    "formatversion": 3
  },
  "prefbar:menu:enabled": {
    "items": [
      "prefbar:button:unpopup"
    ]
  },
  "prefbar:button:unpopup": {
    "type": "button",
    "label": "unpopup",
    "onclick": "var win = document.getElementById(\"main-window\");\nwin.removeAttribute(\"chromehidden\");"
  }
}