Free Ip Hider For Ubuntu Is There A Free IP Changer/hider Or Does Anyone Know How I Can Download FireFox2 Instead Of 3?

Is there a free IP changer/hider or does anyone know how I can download FireFox2 instead of 3? - free ip hider for ubuntu

I want to hide my IP address, and when I downloaded Firefox 3, the add-on I hide my IP address was used ported (at least not yet). Who knows how I can hide my IP address, or Get Firefox 2 again?