For me I only use one browser, Safari. I tried Firefox 3 (I think it was that release) for a week or so after it came out, it didn't feel any faster to me, and I didn't see what the added benefits were by using that instead of Safari which I was used to. I also preferred the way that Safari worked seamlessly with syncing bookmarks with both my computer and my iPod, something that Firefox couldn't offer from what I could tell at the time. I am perfectly satisfied with Safari and have no need to feel like I need to use anything else.