But now it's totally ready for prime time.
You need this extension.
It will change your life.
It's like surfing the web with a condom on.
First, you need to upgrade to Firefox 1.0.5, which was just released. Any other version will still have the bug, and you will curse me in 5 languages. If you're not sure which version you have, go to Help > About Mozilla Firefox. Then get the NoScript extension.
Basically, a lot of malware, adware, popups, and generally badthingsthathappentoyourcompute
Anyway, I've been pretty stoked about this plug in for sometime, especially since more and more publishers were finding ways around pop up blockers. At this time, it truly is the safest way to browse (short of going back to lynx).