diff -r 000000000000 -r 6474c204b198 toolkit/themes/osx/mozapps/handling/handling.css
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/themes/osx/mozapps/handling/handling.css	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,30 @@
+/* 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/. */
+
+#description-image:not([src]) {
+  height: 32px;
+  width: 32px;
+}
+
+richlistitem[type] {
+  min-height: 36px; /* Don't forget to update the richlistbox height! */
+  -moz-padding-start: 2px;
+ }
+
+richlistitem {
+  -moz-box-align: center;
+}
+
+richlistbox {
+  /* 3 items high, plus 4px for top and bottom margins, less 2px for border */
+  min-height: 110px;
+}
+
+.name {
+  font-weight: bold;
+}
+
+.description {
+  color: GrayText;
+}