I'm a webmaster too and it was a nightmare. I've been using FF for years but this last version was just too much for my machine. Maybe you have a faster machine or a lot more memory but FF3 could just bloated up like a Zeppelin every time I run it.
Opera... ah... opera...
We even tried it on the new Vista laptop and it's looking snappier than MSIE.
Hurry up Google, we need on more option.