gecko-dev/browser/themes/linux/searchbar.css

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

%include ../shared/searchbar.inc.css

menuitem[cmd="cmd_clearhistory"] {
  list-style-image: url("moz-icon://stock/gtk-clear?size=menu");
}

menuitem[cmd="cmd_clearhistory"][disabled] {
  list-style-image: url("moz-icon://stock/gtk-clear?size=menu&state=disabled");
}