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

tab.tabbrowser-tab
  {
    display: -moz-box !important;
    height: 25px !important;
    margin-bottom: 0px !important;
    margin-left: 0 !important;
    margin-right: 1px !important;
    margin-top: 1px !important;
    padding: 0 !important;
    -moz-box-sizing: border-box !important;

    border: 1px solid !important;
    border-color: grey !important;
    -moz-border-radius: 0 !important;
  }

.tabs-frame
 {
    margin-bottom: 3px !important;
 }