@namespace url(http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul);

menupopup, popup {
-moz-appearance: none !important;
/*background-color: #fff !important;*/
background:transparent url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAQAAAAECAYAAACp8Z5+AAAAK0lEQVQImVXLMQoAQBDCwP3/ZxU0/VUWVwUCc21pSxKScLaRxPoN29zI2AMNMTyf++yVQgAAAABJRU5ErkJggg==) !important;
-moz-border-radius: 4px !important;
opacity: 0.96 !important; 
}

/*menupopup{
-moz-border-radius:0 0 4px 4px !important;}*/