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

#identity-box > hbox {
  -moz-border-radius-topleft: 0px !important;
  -moz-border-radius-bottomleft: 0px !important;
  background-image: none !important;
  background-color: transparent !important;
  border-left-style: none !important;
}