Hi, I have the same/similar problem as dude 1234.
Firefox using 100% CPUI didnt want to steal his post so I made my own.
I have doing a bit of research on different things for browsers, this amongst them. (Well I dont know that its the browser actually).
Every now and then my computer seems to just grind away, fans rev to their limit, windows wont open and the whole system drags for ages then to a total stop.
It seems as though it is a memory problem, but having read that post, I wondered if it was my browser? I have a Pentium 4 CPU 3.00 Ghz 1.5GB of RAM. My computer doesnt always play up like that but it has its moments.
The easiest way to get past it is to close everything and then restart F/F, this does cure it but is really inconvenient if I have lots of windows open.
Can I do anything to cure this phenomenon please?