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

#urlbar-reload-button, #urlbar-reload-button:hover,
#urlbar-stop-button, #urlbar-stop-button:hover,
#urlbar-go-button, #urlbar-go-button:hover { 
  border-left: 1px solid rgba(0, 0, 0, 0.25) !important;
  margin-top: -1px !important;
  margin-bottom: -1px !important;
  padding-top: 1px !important;
  padding-bottom: 1px !important;
}