<vbox xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" id="customization-panelWrapper"><box class="panel-arrowbox"><image class="panel-arrow" side="top"/></box><box class="panel-arrowcontent" side="top" flex="1"><vbox id="customization-panelHolder"><description id="customization-panelHeader">Overflow Menu</description><description id="customization-panelDescription">Drag and drop items here to keep them within reach but out of your toolbar…</description><vbox id="widget-overflow-fixed-list" class="widget-overflow-list customization-target" customizing="true"/></vbox><box class="panel-inner-arrowcontentfooter" hidden="true"/></box></vbox>