{
  "prefbar:info": {
    "formatversion": 3
  },
  "prefbar:menu:enabled": {
    "items": [
      "prefbar:button:tabfocuscheckbox"
    ]
  },
  "prefbar:button:tabfocuscheckbox": {
    "type": "check",
    "label": "Focus New Tabs",
    "prefstring": "browser.tabs.loadInBackground",
    "topref": "!value",
    "frompref": "!value"
  }
}