In short, processor chips have nothing to do with software vulnerabilities whether Pentium based, AMD or Mac G4 processors.
Web browser security issues, is purely software, programed by incompetent, and so called, programmers.
Microsoft, simply has crap employees in research and development, and always rush beta testing, based on hired up-right monkeys and their inputs, with piss poor, end of the day analysis to push product to us, the end user.
There is no relationship.
IE8 does have bugs, and always will. There will be software patches, then IE9 will appear. By the time Windows 7 goes retail, I.E., will be I.E. 9, nearing I.E.10. Nature of the Microsoft savages.
Firefox is one of the best, in my opinion for just the net, and Mac for browsing is great, and anything that is Linux based. I hate Macintosh, but for net safety, it is hard to beat.
The only other credit I give to Mac is the power towards marketing software in design layout work, ie, publishing magazines, catalogs, artwork, and such. It's a simple business/ marketing computer tool, that can do more, but not for me 99% of the time.
It's better to give this link then write about it. This is a great website courtesy of the Discovery Channel.
http://computer.howstuffworks.com/firefox.htmEnjoy, and research.