Closed Bug 1081535 Opened 8 years ago Closed 7 years ago

Firefox freezes while attempting to modify nvdrssel.bin


(Core :: General, defect)

35 Branch
Windows XP
Not set





(Reporter: obrufau, Unassigned)




(2 files)

User Agent: Mozilla/5.0 (Windows NT 5.1; rv:35.0) Gecko/20100101 Firefox/35.0
Build ID: 20141011030203

Steps to reproduce:

Sometimes, when a new page is loading, my Comodo Firewall Defense+ warns me Firefox is attempting to modify the contents of "C:\WINDOWS\system32\nvdrssel.bin".

It doesn't matter if I allow it or block it.

Actual results:

Firefox freezes (using 0% CPU).

Expected results:

Firefox shouldn't freeze.
And probably, Firefox shouldn't attempt to modify "C:\WINDOWS\system32\nvdrssel.bin".

Before today, Firefox never attempted to modify that file, and there have been 3 attempts. So I think the culprit is today's Nigthly update (Nightly 35.0a1 2014-10-11).
Attached file Demo
This problem was happenning randomly on some sites.

But I have found a pdf which always produces it: the attached demo.

Nigthly 2014-10-10 doesn't have this problem.

I have experimented a bit, and it seems for most people Firefox won't freeze.

Firefox tries to modify those:
 - "C:\WINDOWS\system32\nvdrssel.bin"
 - "\SYSTEM\ControlSet001\Services\Eventlog\Application\NVIDIA OpenGL Driver\TypesSupported"
 - "\SYSTEM\ControlSet001\Services\Eventlog\Application\NVIDIA OpenGL Driver\EventMessageFile"

If I allow or block that very fast, Firefox attempts to modify the next one.
But if I wait a bit for any of them, Firefox freezes.

Therefore, it's likely that people who don't have Comodo firewall (or have it configured to allow/block Firefox to modify those above) won't have any problem.

However, I still think this should be fixed. If Firefox freezes if it can't access that file or registry entries instantly, it probably means that it will also freeze on a computer with a very slow hard disk.
In fact, I had never seen any program which froze because of Comodo asking me to allow or block it.
Product: Firefox → Core
Hi Reporter,

Since Bug 1066280 was fixed and I don't have Comodo Firewall on my environment, could you please try to reproduce your issue on the latest release(43.0.1) and the latest Nightly( and provide the results? When doing this, please use a new clean Firefox profile, maybe even in safe mode, as some of these issues may be caused by third party installed add-ons or custom settings (

Flags: needinfo?(obrufau)
I removed that file and registry keys from the Comodo whitelist, but even then I don't get these warnings anymore, neither on Nightly nor Release.

So I can't no longer reproduce this. Marking as WORKSFORME.
Closed: 7 years ago
Flags: needinfo?(obrufau)
Resolution: --- → WORKSFORME
Moving from Core::Untriaged to Core::General
Component: Untriaged → General
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