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

#search-container #searchbar {
  max-width: 190px !important;
  min-width: 190px !important;
  margin-right: -64px !important;
}
#search-container #searchbar:not([empty="true"]) {
  max-width: 350px !important;
  min-width: 350px !important;
  margin-right: -48px !important;
}