(function(){
    if (document.getElementById("key_myToggleSidebar")) return;
    let key = document.createXULElement("key");
    key.setAttribute("modifiers", "accel");
    key.setAttribute("key", "Q");
    key.setAttribute("oncommand", "SidebarUI.toggle();");
    key.id = "key_myToggleSidebar";
    document.getElementById("mainKeyset").appendChild(key);
}());