Firefox V33.0 locking up system

Sat Nov 29 16:28:44 UTC 2014

On Fri, Nov 28, 2014 at 09:52:12PM -0600, Chris wrote:
> This is Firefox V33 for Ubuntu. Running on Ubuntu 14.04.1 LTS and Gnome
> 3.12.2. I've noticed that periodically Firefox will lockup, clock on top
> task bar will quit running and I'll have to to CTRL-F1, log in and do a
> sudo reboot to restart system. Thinking it may be memory I ran Memtest86
> for 6hrs today with no errors noted. Could the Firefox cached web
> content have anything to do with this? Last night it happened as I was
> scrolling down through my Facebook feed.

Install Cinnamon and see if it works there without freezing - I assume you've disabled any add-ons to Mozilla before posting? Does it happen with add-ons disabled?