@namespace url(http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul);
/* Fitts' Back Button - bigger target on the icon-only toolbar */
toolbar[mode="icons"] > #back-button .toolbarbutton-icon {
  margin-left: 10px !important; 
  margin-right: 20px !important;
}
toolbar[mode="icons"] > #forward-button[disabled="true"] {
   display: none !important;
}