RE: Upgrade???

I don't consider it an upgrade either, but you forget that Mozilla generally fixes security issues ASAP. While this sometimes results in only partly blocking an exploit with the the first patch, this is still preferable to MS's attitude of denying the existence of security flaws until some researcher tires of MS's intransigence and release proof of concept exploit code.

And while Firefox runs IE a close second in number of vulnerabilities over the past 3 years, with 301 vs 350 for IE, according to NIST, I think I will take my chances with FF's "fix early and often" attitude to security, rather than IE's "fix only when have to".

Interestingly I can only find 61 vulnerabilites in NIST for Opera for the same period. Maybe I should switch full-time to Opera?