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

tab:not([selected="true"]) { 
   background-color: rgb(220,220,255) !important;
   font-style: italic !important; }

/* this code is for when the tab is hovered */
tab:not([selected="true"]):hover {
   color: darkblue !important;
   background-color: rgb(227,227,255) !important; }