Robotii

@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"); /* set default namespace to XUL */

 /* Shrink tab titles by 10% */
.tabbrowser-tabs .tab-text {
  font-size: 90%;
}

/* make inactive tabs hardly visible  */
tab:not([selected="true"]) {
    -moz-opacity: 0.5 !important;
}

tab
{
  -moz-appearance: tab;
  margin-top: 2px !important;
  border-top: 2px solid !important;
  border-right: 2px solid !important;
  border-left: 2px solid !important;
  padding: 1px 2px 1px 4px !important;
}

.tab-text {
  margin: 1px !important;
}

tabpanels {
  -moz-appearance: tabpanels;
  border-right: 2px solid;
  border-bottom: 2px solid;
  border-left: 2px solid;
  padding: 0px !important;

}