diff -r 000000000000 -r 6474c204b198 browser/components/sessionstore/test/browser_339445.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/sessionstore/test/browser_339445.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,32 @@
+/* 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/. */
+
+function test() {
+  /** Test for Bug 339445 **/
+
+  waitForExplicitFinish();
+
+  let testURL = "http://mochi.test:8888/browser/" +
+    "browser/components/sessionstore/test/browser_339445_sample.html";
+
+  let tab = gBrowser.addTab(testURL);
+  whenBrowserLoaded(tab.linkedBrowser, function() {
+    let doc = tab.linkedBrowser.contentDocument;
+    is(doc.getElementById("storageTestItem").textContent, "PENDING",
+       "sessionStorage value has been set");
+
+    let tab2 = gBrowser.duplicateTab(tab);
+    whenTabRestored(tab2, function() {
+      let doc2 = tab2.linkedBrowser.contentDocument;
+      is(doc2.getElementById("storageTestItem").textContent, "SUCCESS",
+         "sessionStorage value has been duplicated");
+
+      // clean up
+      gBrowser.removeTab(tab2);
+      gBrowser.removeTab(tab);
+
+      finish();
+    });
+  });
+}