diff -r 000000000000 -r 6474c204b198 toolkit/themes/osx/global/checkbox.css
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/themes/osx/global/checkbox.css	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,39 @@
+/* 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");
+
+checkbox {
+  -moz-appearance: checkbox-container;
+  -moz-box-align: center;
+  margin: 4px 2px;
+}
+
+.checkbox-icon {
+  margin-right: 2px;
+}
+
+.checkbox-label {
+  margin: 1px 0 !important;
+}
+
+/* ..... disabled state ..... */
+
+checkbox[disabled="true"] {
+  color: GrayText !important;
+}
+
+/* ::::: checkmark image ::::: */
+
+.checkbox-check {
+  -moz-appearance: checkbox;
+  margin: 1px 1px 0;
+  /* vertical-align tells native theming where to snap to. However, this doesn't
+   * always work reliably because of bug 503833. */
+  vertical-align: top;
+  width: 1.3em;
+  height: 1.3em;
+}
+  
+