System freeze-up

[Moltke]

I didn't get any errors in the terminal so I closed it and deleted mozilla.old and started Firefox from the taskbar like usual.  Soon after that it froze.  But... like I said - I am not sure if it is the fault of FF - I am just assuming it might be.  It also might NOT be...?

I see. Sure, it can be a number of things other than FF, but since you mentioned it, it's a good starting point. That's why I suggested you to download it, to try and see whether it is the installed version the culprit. If it's not, then you can start looking somewhere else, and we can help you do that.