From e5fb3daccc4e8f516bb6253e9f3bfc4988ced25d Mon Sep 17 00:00:00 2001
From: "dbaron%dbaron.org" <dbaron%dbaron.org>
Date: Tue, 5 Apr 2005 04:41:41 +0000
Subject: [PATCH] Put try/catch around removeObserver that sometimes
 (inexplicably) fails.  b=288770  r=mconnor

---
 toolkit/content/widgets/browser.xml | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/toolkit/content/widgets/browser.xml b/toolkit/content/widgets/browser.xml
index d177b539da6c..2d00477a0b91 100644
--- a/toolkit/content/widgets/browser.xml
+++ b/toolkit/content/widgets/browser.xml
@@ -575,7 +575,11 @@
 
           if (!this.hasAttribute("disablehistory")) {
             var os = Components.classes["@mozilla.org/observer-service;1"].getService(Components.interfaces.nsIObserverService);
-            os.removeObserver(this, "browser:purge-session-history", false);
+            try {
+              os.removeObserver(this, "browser:purge-session-history", false);
+            } catch (ex) {
+              // It's not clear why this sometimes throws an exception.
+            }
           }
 
           if (this.mDragDropHandler)