Simon

So Firefox authors could have predicted IE7 sending 'attack' code at it?

Actually, yes, that it exactly what they should expect, what we should ALL expect from Microsoft software; we should expect the worst in order to enable us to have suitable defenses in place for our own safety.

...so, contrarily, installing and using Firefox is really not such bad advice, even if John seems to have been imbibing with Nostradamus last night.

Okay, it is jolly good advice - personally I advise all my customers to keep Internet Explorer use to the minimum, and to use Opera or Firefox or Seamonkey first on all occasions, before troubling with the unknown perils of microsofts standards non-compliant browser. This is just the most likely best route to avoiding trouble, esp. if combined with sensible surfing habits.

Now, how do I get enslaved by a botnet using Firefox... let me see... Did you just say it is impossible?? Really?