diff -r 000000000000 -r 6474c204b198 toolkit/themes/osx/global/richlistbox.css
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/themes/osx/global/richlistbox.css	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,27 @@
+/* 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/. */
+
+@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul");
+
+richlistbox {
+  -moz-appearance: listbox;
+  margin: 2px 4px;
+  background-color: -moz-Field;
+  color: -moz-FieldText;
+}
+
+richlistbox[disabled="true"] {
+  color: GrayText;
+}
+
+richlistitem[selected="true"] {
+  background-color: -moz-Dialog;
+  color: -moz-DialogText;
+}
+
+richlistbox:focus > richlistitem[selected="true"] {
+  background-color: Highlight;
+  color: HighlightText;
+}
+