My car is almost as old as XP, my wife' is older - both work fine.
I'd certainly hope that your wife is older than XP!
Firefox is for anyone who does not want to deal with that ingrained in the system bloated piece of crap security nightmare that is IE.
By "IE" are you referring to IE 6 or to IE 8 and 9?
"The hands that help are better far than the lips that pray." -- Robert G. Ingersoll