In an interview with ZDNet, Charlie Miller (winner of CanSecWest’s Pwn2Own contest) said,”For all the browsers on operating systems, the hardest target is Firefox on Windows.” He notes also that,”It’s more about the operating system than the (target) program. Firefox on Mac is pretty easy too. The underlying OS doesn’t have anti-exploit stuff built into it.”
He says throughout the interview that OSX is extremely easy to crack. Just interesting.