diff -r 000000000000 -r 6474c204b198 browser/components/tabview/test/browser_tabview_bug624692.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/components/tabview/test/browser_tabview_bug624692.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,26 @@
+/* Any copyright is dedicated to the Public Domain.
+   http://creativecommons.org/publicdomain/zero/1.0/ */
+
+function test() {
+  requestLongerTimeout(2);
+  waitForExplicitFinish();
+
+  newWindowWithTabView(function (win) {
+    registerCleanupFunction(function () win.close());
+
+    let cw = win.TabView.getContentWindow();
+    let groupItem = cw.GroupItems.groupItems[0];
+    let tabItem = groupItem.getChild(0);
+
+    hideGroupItem(groupItem, function () {
+      unhideGroupItem(groupItem, function () {
+        let bounds = tabItem.getBounds();
+        groupItem.arrange({immediately: true});
+        ok(bounds.equals(tabItem.getBounds()),
+           "tabItem bounds were correct after unhiding the groupItem");
+
+        finish();
+      });
+    });
+  });
+}