This is an unfair comparison. No single version of Firefox has greater marketshare than any single version of Internet Explorer. If you take all version of Firefox together, yes they do beat the oldest version of Internet Explorer still in wide usage, IE6, but that's comparing apples and oranges.<p>Web developers still have to target multiple versions of Firefox, and Firefox 2.x supports fewer things than Firefox 3.x. Likewise, developers still have to target IE6 (23.3% share), which supports even fewer web standards than pretty much every other version of every other major browser in wide usage.<p>Nevertheless, it's hard to understand how this comparison is valid or significant.