From 33525e29891ce5464c049cecadac66b745e9d921 Mon Sep 17 00:00:00 2001
From: Piro / SHIMODA Hiroshi <piro@p.club.ne.jp>
Date: Wed, 12 Jan 2011 04:06:46 +0900
Subject: [PATCH] make it safe

---
 content/treestyletab/treestyletabbrowser.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/content/treestyletab/treestyletabbrowser.js b/content/treestyletab/treestyletabbrowser.js
index 298d52b1..58e59546 100644
--- a/content/treestyletab/treestyletabbrowser.js
+++ b/content/treestyletab/treestyletabbrowser.js
@@ -3368,7 +3368,8 @@ TreeStyleTabBrowser.prototype = {
 			!w.UI ||
 			!w.UI.setReorderTabItemsOnShow ||
 			!w.GroupItems ||
-			!w.GroupItems.getActiveGroupItem
+			!w.GroupItems.groupItems ||
+			!w.GroupItems.groupItems.length
 			)
 			return;