diff -r 000000000000 -r 6474c204b198 browser/components/tabview/test/browser_tabview_bug659594.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/tabview/test/browser_tabview_bug659594.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,39 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function test() {
+  waitForExplicitFinish();
+
+  newWindowWithTabView(function(win) {
+    let numTabsToUpdate = 2;
+
+    showTabView(function() {
+      let contentWindow = win.TabView.getContentWindow();
+      let groupItem = contentWindow.GroupItems.groupItems[0];
+
+      groupItem.getChildren().forEach(function(tabItem) {
+        tabItem.addSubscriber("updated", function onUpdated() {
+          tabItem.removeSubscriber("updated", onUpdated);
+
+          if (--numTabsToUpdate == 0)
+            finish();
+        });
+        contentWindow.TabItems.update(tabItem.tab);
+      });
+    }, win);
+  }, function(win) {
+    BrowserOffline.toggleOfflineStatus();
+    ok(Services.io.offline, "It is now offline");
+
+    let originalTab = win.gBrowser.tabs[0];
+    originalTab.linkedBrowser.loadURI("http://www.example.com/foo");
+    win.gBrowser.addTab("http://www.example.com/bar");
+
+    registerCleanupFunction(function () {
+      if (Services.io.offline)
+        BrowserOffline.toggleOfflineStatus();
+      win.close();
+    });
+  });
+}
+