Firefox 3 releases today and the mozilla folks hope to set a new record for downloads in one day. It's supposed to be awesome and you know you've always wanted to see the internet without IE (although IE only accounts for 42% of the visitors to my church website.) So what are you waiting for...go get firefox now
Be ready for a slow download. Setting a record takes a lot of bandwidth. Also, sooner or later all your extensions will be updated, they will work again. Don't worry.