Originally Posted by mattjblythe
Every so often, all of my browser windows just close, at the same time. I'm not doing anything that could cause this, so why is it happening? It's quite frustrating.
Well, it's hard to say. You don't say what version of Firefox, how many browser windows you have up (or do you mean tabs?), on what version and distro of Linux, or what web sites/apps you have up when it crashes.
With no information, no one will be able to diagnose a problem.