Hi DavidR,
I have the FF 3.0 RC1 which is much better memory wise as I have it as a portable apps installed. The memory handling is also depending on the particular kind of add-ons you have installed: ABP is notorious, NoScript should be mem conserving, but I am not too sure about that. You get a fair idea of what the Firefox executable is doing launching it in safe mode. At the moment I am quite satisfied with 3.0 RC1, everything flies, all my favourite add-ons installed, no sweat, and I am 14.000 updates further than the user of the FF 2.0.0.14 ......
polonus