diff -r 000000000000 -r 6474c204b198 browser/components/tabview/test/browser_tabview_alltabs.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/tabview/test/browser_tabview_alltabs.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,45 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function test() {
+  waitForExplicitFinish();
+
+  let AllTabs;
+  let newTab = gBrowser.addTab();
+
+  // TabPinned
+  let pinned = function (event) {
+    let tab = event.target;
+
+    is(tab, newTab, "The tabs are the same after the tab is pinned");
+    ok(tab.pinned, "The tab gets pinned");
+
+    gBrowser.unpinTab(tab);
+  };
+
+  // TabUnpinned
+  let unpinned = function (event) {
+    let tab = event.target;
+
+    AllTabs.unregister("pinned", pinned);
+    AllTabs.unregister("unpinned", unpinned);
+
+    is(tab, newTab, "The tabs are the same after the tab is unpinned");
+    ok(!tab.pinned, "The tab gets unpinned");
+
+    // clean up and finish
+    gBrowser.removeTab(tab);
+    hideTabView(finish);
+  };
+
+  showTabView(function () {
+    AllTabs = TabView.getContentWindow().AllTabs;
+
+    AllTabs.register("pinned", pinned);
+    AllTabs.register("unpinned", unpinned);
+
+    ok(!newTab.pinned, "The tab is not pinned");
+    gBrowser.pinTab(newTab);
+  });
+}
+