491253 - Script failure in nsProxyAutoConfig is popping up continously

Status: RESOLVED DUPLICATE of bug 235853

(Firefox :: General, defect)

Description

[Peter]

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1b4) Gecko/20090423 Firefox/3.5b4
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1b4) Gecko/20090423 Firefox/3.5b4

When I visit a specific webpage, a script failure pop-up appears over and over again, not giving me the ability to shut the page down in between. When the pop-up has been removed by clicking "Stop script", the entire Firefox window is frozen, until the pop-up pops up again.

It does not help to click "Don't ask me again", the pop-up will come back after a couple of seconds.

I am surfing through a proxy at work, where I have activated "Automatic Proxy Configuration" pointing to a "accelerated_pac_base.pac" file on our proxy server. It works on all other websites, but crashes horribly on this specific page.

Reproducible: Always

Steps to Reproduce:
0. Setup automatic proxy. I don't know if this is the root of the problem.
1. Visit webpage
2. Wait for it to load
3. The pop-up will occur
Actual Results:  
Firefox freezes completely, except when the pop-up is shown.

Expected Results:  
Page is rendered correctly etc etc.

I am running Mozilla Firefox 3.5 Beta 4, otherwise everything is "vanilla".

Comment 1

[Peter]

Attachment: Screenshot of the error

Comment 2

[timeless]

could you possibly attach accelerated_pac_base.pac? (note: you might need to get permission from someone).

Comment 3

[timeless]

fwiw, the dialog basically means your pac file is calling dnsResolve.

Most likely it's calling it a lot (or an infinite number of times).

PAC sadly runs on the UI thread and as such blocks everything else.

Comment 4

[Peter]

Attachment: Somewhat edited pac-file for obscurity

Hope the edits doesn't affect the bug hunt

Comment 5

[Tyler Downer [He/Him]]

This is a mass search for bugs which are in the Firefox General component, are
UNCO, have not been changed for 500 days and have an unspecified version. 

Reporter, can you please update to Firefox 3.6.10 or later, create a fresh profile, http://support.mozilla.com/en-US/kb/managing+profiles, and test again. If you still see the issue, please update this bug. If the issue is gone, please set the status to RESOLVED > WORKSFORME.

Comment 6

[Tyler Downer [He/Him]]

No reply from reporter, INCOMPLETE. Please retest with Firefox 3.6.12 or later and a new profile (http://support.mozilla.com/kb/Managing+profiles). If you continue to see this issue with the newest firefox and a new profile, then please comment on this bug.