From a0ca379cfddde5b88007211d6f6ebdf9748f7409 Mon Sep 17 00:00:00 2001
From: Kris Maglione <maglione.k@gmail.com>
Date: Tue, 15 Mar 2011 10:51:12 -0400
Subject: [PATCH] Work around inane bug in Google's Page Speed extension.
 Closes issue #438.

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

diff --git a/common/content/tabs.js b/common/content/tabs.js
index dec2dcca..efb44b43 100644
--- a/common/content/tabs.js
+++ b/common/content/tabs.js
@@ -103,7 +103,8 @@ var Tabs = Module("tabs", {
     get browsers() {
         let browsers = config.tabbrowser.browsers;
         for (let i = 0; i < browsers.length; i++)
-            yield [i, browsers[i]];
+            if (browsers[i] !== undefined) // Bug in Google's Page Speed add-on.
+                yield [i, browsers[i]];
     },
 
     /**