diff -r 000000000000 -r 6474c204b198 browser/components/sessionstore/test/browser_579868.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/sessionstore/test/browser_579868.js	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/. */
+
+function test() {
+  let tab1 = gBrowser.addTab("about:rights");
+  let tab2 = gBrowser.addTab("about:mozilla");
+  whenBrowserLoaded(tab1.linkedBrowser, mainPart);
+  waitForExplicitFinish();
+
+  function mainPart() {
+    // Tell the session storer that the tab is pinned
+    let newTabState = '{"entries":[{"url":"about:rights"}],"pinned":true,"userTypedValue":"Hello World!"}';
+    ss.setTabState(tab1, newTabState);
+
+    // Undo pinning
+    gBrowser.unpinTab(tab1);
+
+    // Close and restore tab
+    gBrowser.removeTab(tab1);
+    let savedState = JSON.parse(ss.getClosedTabData(window))[0].state;
+    isnot(savedState.pinned, true, "Pinned should not be true");
+    tab1 = ss.undoCloseTab(window, 0);
+
+    isnot(tab1.pinned, true, "Should not be pinned");
+    gBrowser.removeTab(tab1);
+    gBrowser.removeTab(tab2);
+    finish();
+  }
+}