diff -r 000000000000 -r 6474c204b198 toolkit/themes/osx/global/dialog.css
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/themes/osx/global/dialog.css	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,77 @@
+/* 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");
+
+#commonDialog > image {
+  -moz-margin-end: 14px !important;
+}
+
+#commonDialog > .dialog-button-box {
+  -moz-margin-start: 80px;
+}
+
+dialog { 
+  -moz-appearance: dialog;
+  padding: 14px;
+}
+
+/* ::::: dialog buttons ::::: */
+
+.dialog-button {
+  font: menu;
+}
+
+/* ::::: dialog header ::::: */
+
+dialogheader {
+  margin: 0 5px 5px;
+  padding: 5px 8px;
+}
+
+.dialogheader-title {
+  margin: 0 !important;
+  font-size: larger;
+  font-weight: bold;
+  display: none;
+}
+
+/* ::::: large dialog header ::::: */
+
+.header-large {
+  -moz-box-orient: vertical;
+  margin: -14px -14px 0;
+  padding: 12px;
+  -moz-padding-end: 5px;
+  -moz-padding-start: 25px;
+}
+
+.header-large > .dialogheader-title {
+  font: inherit;
+  font-weight: bold;
+}
+
+.header-large > .dialogheader-description {
+  margin-left: 12px !important;
+}
+
+.dialogheader-description {
+  font-weight: bold !important;
+}
+
+.dialogheader-title {
+  font-weight: bold !important;
+}
+
+/*XXX - belongs to toolkit/content/finddialog.xul: */
+
+#findDialog,
+#findDialog > menu,
+#findDialog > groupbox {
+  font: menu !important;
+}
+
+#dialog\.caseSensitive {
+  margin-top: 8px;
+}