I was quite surprised to see my computers memory usage creep up to 811,316K with FireFox (1.07) open with two tabs, minimal graphics and no pages containing applets. I realise Firefox has many problems with memory usage and multiple tabs, (I’m not sure if thats still the case) and also with a large number of graphics. However i’m a little confused as to why it would be so high… I’ll give Browser.cache.memory.capacity a try and see if that helps, any one else had Firefox try to kill your computer?

http://kb.mozillazine.org/Memory_Leak