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

#PersonalToolbar[collapsed="true"] {
    -moz-transition: none !important;
   }

#PersonalToolbar:not([collapsed="true"]) {
    visibility: collapse !important;
    opacity: 0.5;
    -moz-transition: visibility 30s, opacity 30s ease !important;
   }

#navigator-toolbox:hover #PersonalToolbar:not([collapsed="true"]) {
    visibility: visible !important;
    opacity: 1;
    -moz-transition: visibility !important;
   }