I was using 3.5.3 - have only now upgraded to 3.5.4, to see if it's any different.Which version of FF are you using? I was using 3.0.10, and it was a memory hog. Manually d'led 3.5.1 and a lot of the memory hog issues seemed to go away. You should check and see which version you have.I've now been looking at alternatives to Firefox as it's taking up too many resources on my Vista computer, occasionally freezing, and needing periodic shutdowns to clear the memory.
Just revisited Chrome - it just looks odd to me.
Chrome takes a little getting used to, stick with it because it really is faster than the others