not just tabs, but searches right from the browser that you can customize in a matter of seconds.
I really like being able to search the web, the dictionary, or IMDB without having to go to the web site first.
Right on Flash.
Firefox has impressed me so much that I'm trying to wean myself from Windows by going to Linux. I'm using the Mepis distribution, and so far am doing well with it. Haven't had to run Windows for much yet. Check out Mepis by clicking here.