diff -r 000000000000 -r 6474c204b198 browser/components/tabview/test/browser_tabview_bug602432.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/tabview/test/browser_tabview_bug602432.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() {
+  let checkUpdateTimes = function (groupItem) {
+    let children = groupItem.getChildren();
+    let earliestUpdateTime = children.shift()._testLastTabUpdateTime;
+
+    children.forEach(function (tabItem) {
+      let updateTime = tabItem._testLastTabUpdateTime;
+      ok(earliestUpdateTime <= updateTime, "Stacked group item update (" +
+         updateTime + ") > first item (" + earliestUpdateTime + ")");
+    });
+  }
+
+  waitForExplicitFinish();
+
+  newWindowWithTabView(function (win) {
+    registerCleanupFunction(function () win.close());
+
+    let numTabsToUpdate = 10;
+    let groupItem = createGroupItemWithBlankTabs(win, 150, 150, 100, numTabsToUpdate, false);
+    ok(groupItem.isStacked(), "groupItem is stacked");
+
+    let cw = win.TabView.getContentWindow();
+    cw.TabItems.pausePainting();
+
+    groupItem.getChildren().forEach(function (tabItem) {
+      tabItem.addSubscriber("updated", function onUpdated() {
+        tabItem.removeSubscriber("updated", onUpdated);
+        tabItem._testLastTabUpdateTime = tabItem._lastTabUpdateTime;
+
+        if (--numTabsToUpdate)
+          return;
+
+        checkUpdateTimes(groupItem);
+        finish();
+      });
+
+      cw.TabItems.update(tabItem.tab);
+    });
+
+    cw.TabItems.resumePainting();
+  });
+}