Is it just my imagination or is Firefox 3 really lighting fast? My manager seems to notice that too.
And the memory usage so far never exceeded 100k (it's been around 95k for my usage pattern). My Firefox usage pattern is consisting of opening quite a number of tabs (usually at least 10 tabs), I believe because of this Firefox 2 quite often crashes (memory usage can easily grow to 200k) but this hasn't been the case with Firefox 3.
So far I am quite impressed.