@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
#urlbar:not(:hover) > .urlbar-textbox-container > .urlbar-history-dropmarker {
opacity: 100 !important;
}

@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
.urlbar-history-dropmarker {
display: none !important;
}