Yup have had a few issues with firefox 3..stuff that worked great in firefox 2..
broken in firefox 3..etc..

love the new features of ff3..and the great new plug ins..

I recommend..having both..there's a way to install Firefox 2 and 3 on your
system...and even run both side by side.. it's great..having the old
trusty compatibly of FF2..and the great new features of FF3..when
u do a dual install, even keeps the plug ins separate for each browser
no confusion..

just google installng firefox 2 and 3..you'll get several different ways to
do this, some easy, some complicated, I took the easy route..works good.