Firefox hangs and makes the whole system unresponsive




9 years ago
7 years ago


(Reporter: fodber, Unassigned)


3.5 Branch
Windows XP

Firefox Tracking Flags

(Not tracked)


(Whiteboard: [CLOSEME 2011-2-25], URL)



9 years ago
User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv: Gecko/20090729 Firefox/3.5.2 (.NET CLR 3.5.30729)
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-GB; rv: Gecko/20090729 Firefox/3.5.2 (.NET CLR 3.5.30729)

If loaded the page (a long forum), firefox hangs and the whole system gets unresponsive. Even starting the task manager to kill firefox.exe is impossible.

Reproducible: Always

Steps to Reproduce:
1. Open

Actual Results:  
Firefox hangs, and I can't even close its window. Other windows are drawn partially. Can't start new applications.

Expected Results:  
After some time the page loads, during loading, I can browse on other tabs.

I have a dual core system.
Firefox can not cause whole system hangs. This could be some interaction between Firefox and your firewall, antivirus, etc.

Please try creating a new firefox Profile,, and see what happens.
Severity: critical → major
Version: unspecified → 3.5 Branch

Comment 2

9 years ago
After creating a profile the system doesn't hang. 
But Firefox takes a lot of memory and appears to be thrashing. I killed the firefox.exe process with Process Explorer (as the Windows task manager wasn't able to actually kill it). At that time after some minutes of processing the memory consumption was >500 MB.
IE 7 loads the page in a few seconds with 200MB memory consumption.
Reporter, are you still seeing this issue with Firefox 3.6.13 or later in safe mode or a fresh profile? If not, please close. These links can help you in your testing.
Whiteboard: [CLOSEME 2011-2-25]
This bug has had the CLOSEME tag for several weeks and the date in the tag is
far gone. If the reporter can still see this issue, Please retest with Firefox
3.6.x or later and a new profile
( Then please remove the
closeme tag in the whiteboard, mark the bug against the proper version and
comment on the bug.
Last Resolved: 7 years ago
Resolution: --- → INCOMPLETE
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