
So, as a web designer and a computer "professional", I recommend using it. Both for keeping viruses on the other side of the internet, faster browsing, etc etc... If everyone would be using it, my work as an internet designer would be a lot simpler.
Well, it does take some time to get used to it, but once you go FF you can't go back

www.mozilla.com/firefox/
Btw, Slovenia (my country) leads with the percentage of users, with about 35% of the public using it.