I'm with lynch. After using IE for years, I finally decided to give Firebird a go (only recently) and I must say that I am impressed!!

It is a great browser and I find the tabbed browsing very convenient, including the way you can navigate through the tabs completely with the keyboard - very handy

If you've tried Mozilla, but not Firebird, give it a go...i see a huge difference and may advantages in using Firebird!