Mozilla First To Patch Pwn2Own Browser Vulnerability
Constantine the Less writes "Mozilla has released Firefox 3.0.8 to fix a pair of code execution holes that put users of the browser at risk of drive-by download attacks. It includes a fix for one of the flaws exploited during this year's CanSecWest Pwn2Own hacker contest. The update also fixes a separate zero-day flaw disclosed earlier this week on a public exploit site. Both issues are rated 'critical,' Mozilla's highest severity rating."
You could try not freaking the fuck out about browser security, unless you plan on visiting Russian spam sites and whatnot. I use Firefox on Linux and I've never had an issue. I use Flashblock, Adblock and occasionally Noscript. Just exercise reasonable caution and you should be fine. Heck, even under Windows I never got viruses or spyware, and I used IE!