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

.tabbrowser-tab[selected="true"] > hbox,
.tabbrowser-tab[selected="true"] > .tab-close-button {
  background-color: #00f !important;
  color: #fff !important;
}

.tabbrowser-tab[selected="true"]:hover > hbox,
.tabbrowser-tab[selected="true"]:hover > .tab-close-button {
  background-color: purple !important;
  color: #fff !important;
}

.tabbrowser-tab[selected="false"] > hbox,
.tabbrowser-tab[selected="false"] > .tab-close-button {
  background-color: #abc !important;
  color: black !important;
}
.tabbrowser-tab[selected="false"]:hover > hbox,
.tabbrowser-tab[selected="false"]:hover > .tab-close-button {
  background-color: green !important;
  color: white!important;
}


.tabbrowser-tab> hbox,
.tabbrowser-tab> .tab-close-button 
{
  background-color: red  !important;  /*#009999*/
  color: white !important;
}
.tabbrowser-tab:hover > hbox,
.tabbrowser-tab:hover > .tab-close-button {
  background-color: purple  	 !important;
  color: red !important;
}