535234 - Browser hangs when browsing via a proxy server after 3.5.6 upgrade

Status: VERIFIED DUPLICATE of bug 535193

(Core :: Networking: HTTP, defect)

Description

[Tyler Retelle]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1.6) Gecko/20091201 Firefox/3.5.6 (.NET CLR 2.0.50727; .NET CLR 3.0.30729; .NET CLR 3.5.21022; .NET CLR 3.5.30729)
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.1.6) Gecko/20091201 Firefox/3.5.6 (.NET CLR 2.0.50727; .NET CLR 3.0.30729; .NET CLR 3.5.21022; .NET CLR 3.5.30729)

After upgrading from 3.5.5 to 3.5.6, browsing through a proxy server frequently (over 50% of the time) causes the browser to hang.

Reproducible: Sometimes

Steps to Reproduce:
1. Browse the Internet via a proxy server.
Actual Results:  
Browser hangs on page load over 50% of the time.

Expected Results:  
Browser is still usable while loading a page.

This appears to be some sort of regression from 3.5.5.

Comment 1

[Tyler Retelle]

Here are some posts from others with the same issue:

https://support.mozilla.com/en-US/forum/1/526517?

Comment 2

[Matthias Versen [:Matti]]

Many other user reported this in some Forums (heise.de as example).
marking new

Comment 3

[Matthias Versen [:Matti]]

Rewporter: 
Do you already tried http://support.mozilla.com/en-US/kb/Safe+Mode and created a new profile http://support.mozilla.com/en-US/kb/Managing%20profiles ?

Comment 4

[Tyler Retelle]

I just tested in both safe mode and with a new profile and can confirm that the problem still occurs.

Comment 5

[kappa7194]

Hi, I too am experiencing this problem. I've just applyed the 3.5.6 patch, and since then my Firefox hangs for about 15/30 seconds every page request.

I already tried disabling the add-ons, deleting the cache and history, starting in safe mode, creating a new profile, etc etc to no avail.

I too am using an NTLM proxy, and the problem appears only when browsing through it, switching to a non NTLM one seems to resolves the problem.

User agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv:1.9.1.6) Gecko/20091201 Firefox/3.5.6 (.NET CLR 3.5.30729)

Comment 6

[Brian Polidoro]

This looks to be the same as bug 535193.