userChrome.css

/*
 * Do not remove the @namespace line -- it's required for correct functioning
 */
@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"); /* set default namespace to XUL */



/* Change Tab Colors */

/* Change color of active tab */
/* NOTE, THIS LAYOUT CAN CAUSE THE APPEARANCE TO CHANGE! */
/* ie if you join the lines together, the colored tab changes!? */
/* ALSO, this '-moz-appearance: none !important;' line MUST B THERE! */
tab{
   -moz-appearance: none !important;
   }
tab[selected="true"] {
   background-color: rgb(0,255,0) !important;
   color: black !important;
   }




// ugh, this is some really ugly wrapping of tabs that xxx from mozillazine posted, ugh!
/*
tabs>tab
{
   margin-left: 2px !important;
   margin-right: 2px !important;
   width: 180px !important;
}

tabs>stack>vbox>hbox>hbox
{
  display: block !important;
  overflow: visible !important;
}


.tabs-newbutton {top: 0px !important}
.tabs-closebutton-box {top: 0px !important}
*/