@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: #36f !important;
  color: #fff !important;
}

.tabbrowser-tab[selected="true"]:hover > hbox,
.tabbrowser-tab[selected="true"]:hover > .tab-close-button {
  background-color: #36f !important;
  color: #fff !important;
}

.tabbrowser-tab:not([selected="true"]) > hbox,
.tabbrowser-tab:not([selected="true"]) > .tab-close-button {
   background-color: #bcf !important;
}
.tabbrowser-tab:not([selected="true"]):hover > hbox,
.tabbrowser-tab:not([selected="true"]):hover > .tab-close-button {
   background-color: #69f !important;
}

/* Make the active tab text not bold */
.tabbrowser-tab[selected="true"] { font-weight: normal !important; }

/* Hide focus ring on active tab and maybe everywhere */
.tab-text { border: none !important; }

/* the rules below are optional, you can remove them */

.tabs-bottom {
  background-color: #36f !important;
}