diff -r 000000000000 -r 6474c204b198 browser/components/preferences/sanitize.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/preferences/sanitize.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,12 @@
+/* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* 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/. */
+
+let gSanitizeDialog = Object.freeze({
+  onClearHistoryChanged: function () {
+    let downloadsPref = document.getElementById("privacy.clearOnShutdown.downloads");
+    let historyPref = document.getElementById("privacy.clearOnShutdown.history");
+    downloadsPref.value = historyPref.value;
+  }
+});