I don't really consider myself to be a power-web browser. But my frustration with Firefox, especially the memory leaks combined with Flash difficulties drove me to desperate measures.
I decided to let Apple's software updater install Safari on my computer. I liked the speed, I liked the rendering, but the fact that I couldn't use the tab key to navigate was irritating. I managed to crash it a couple of times, and it would frequently seize up. So, it's back to the Fox with me, and waiting for version 3.