diff -r 000000000000 -r 6474c204b198 browser/components/sessionstore/test/browser_579879.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/sessionstore/test/browser_579879.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,21 @@
+function test() {
+  waitForExplicitFinish();
+
+  var tab1 = gBrowser.addTab("data:text/plain;charset=utf-8,foo");
+  gBrowser.pinTab(tab1);
+
+  whenBrowserLoaded(tab1.linkedBrowser, function() {
+    var tab2 = gBrowser.addTab();
+    gBrowser.pinTab(tab2);
+
+    is(Array.indexOf(gBrowser.tabs, tab1), 0, "pinned tab 1 is at the first position");
+    gBrowser.removeTab(tab1);
+    tab1 = undoCloseTab();
+    ok(tab1.pinned, "pinned tab 1 has been restored as a pinned tab");
+    is(Array.indexOf(gBrowser.tabs, tab1), 0, "pinned tab 1 has been restored to the first position");
+
+    gBrowser.removeTab(tab1);
+    gBrowser.removeTab(tab2);
+    finish();
+  });
+}