I don't think there's much point in worrying about drive-by browser attacks. We all visit a lot of sites, and many sites are hacked without their owners knowing

I don't think there's much point in worrying about drive-by browser attacks. We all visit a lot of sites, and many sites are hacked without their owners knowing, but just serving malware/phishing/redirects for spam, ad networks, and injection into more popular sites. If a browser 0day really did apply to my up-to-date version of firefox and really was a problem, well, I'd feel pretty screwed.