[Nouveau] launching Firefox causes system crash

[Grant]

>>>>>> Launching firefox is causing a system crash with a black or white
>>>>>> screen and diagonal lines across it.  I've tried the latest nouveau
>>>>>> from git and the latest kernel.  I can't find anything in the logs
>>>>>> unfortunately.  Any ideas?
>>>>>>
>>>>>> 00:0d.0 VGA compatible controller: NVIDIA Corporation C61 [GeForce
>>>>>> 6150SE nForce 430] (rev a2) (prog-if 00 [VGA controller])
>>>>>>     Subsystem: Micro-Star International Co., Ltd. Device 7309
>>>>>>     Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 40
>>>>>>     Memory at de000000 (32-bit, non-prefetchable) [size=16M]
>>>>>>     Memory at c0000000 (64-bit, prefetchable) [size=256M]
>>>>>>     Memory at dd000000 (64-bit, non-prefetchable) [size=16M]
>>>>>>     Expansion ROM at dfd40000 [disabled] [size=128K]
>>>>>>     Capabilities: [48] Power Management version 2
>>>>>>     Capabilities: [50] MSI: Enable+ Count=1/1 Maskable- 64bit+
>>>>>>     Kernel driver in use: nouveau
>>>>>
>>>>> Someone just opened a bug about NV4E. You have NV4C, but one could
>>>>> imagine that there would be similarities. See
>>>>> https://bugs.freedesktop.org/show_bug.cgi?id=73445 and feel free to
>>>>> add yourself to it if that matches your symptoms (esp if it's a 3.13
>>>>> regression). Otherwise, more information would be nice. See
>>>>> http://nouveau.freedesktop.org/wiki/Bugs/ for the sort of information
>>>>> that's generally useful.
>>>>
>>>> I should also mention that rebooting allows firefox to open.  It seems
>>>> to crash if it is opened after the system has been running for awhile.
>>>>
>>>> I tried nouveau.config=NvMSI=0 but it didn't help.
>>>>
>>>> - Grant
>>>
>>> Can anyone help me out here?  This has been really disruptive to my
>>> organization.  Unchecking "Use hardware acceleration when available"
>>> in firefox also doesn't seem to fix it.  Anything else I could try?
>>
>> Launch firefox with LIBGL_ALWAYS_SOFTWARE=1 -- that should avoid using
>> nouveau for any sort of 3d.
>>
>> Is this a new thing, or has it always been the case? If it's new, any
>> idea what changed?
>
> Thank you, I will try that ASAP.  I was trying to use the epiphany and
> midori browsers for a long time but eventually had to give up and
> switch to firefox and this problem popped up right away.
>
> - Grant

Is there anything I could put in xorg.conf for this?  The system
that's having trouble is being used in a remote office and I'm not
sure its users are up to the task of LIBGL_ALWAYS_SOFTWARE=1.

- Grant