diff -r 000000000000 -r 6474c204b198 browser/components/tabview/test/browser_tabview_bug624953.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/tabview/test/browser_tabview_bug624953.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,23 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function test() {
+  waitForExplicitFinish();
+
+  showTabView(function () {
+    let cw = TabView.getContentWindow();
+
+    let groupItem = createGroupItemWithBlankTabs(window, 200, 240, 20, 4)
+    ok(!groupItem.isStacked(), 'groupItem is not stacked');
+    cw.GroupItems.pauseArrange();
+
+    groupItem.setSize(100, 100, true);
+    groupItem.setUserSize();
+    ok(!groupItem.isStacked(), 'groupItem is still not stacked');
+
+    cw.GroupItems.resumeArrange();
+    ok(groupItem.isStacked(), 'groupItem is now stacked');
+
+    closeGroupItem(groupItem, function () hideTabView(finish));
+  });
+}