i have been using firefox since before it was firefox. firebird back in those days. you didnt even have to install it, just an exe that ran like a top.
i have firefox setup just like i like it, so i cant see switching to anything else and have to relearn everything. a few sites we use at work wont work with firefox. so i use IE then, and i have to say that i hate the new layout. i can never find the refresh or stop buttons. plus i block flash with firefox, and i hate that i have to watch all these flash ads with ie.
i have opera installed on my mac, and i have used it some.
i dont understand why IE cant be compliant with w3c standards just like everyone else? i just got finished doing some work on our company web site, and my layout worked perfectly in opera and firefox but not in IE6 or 7. i had to tweak the code just for IE.