upgrading firefox

[Steven Seipel]

I have freebsd 7.2 with gnome. It has firefox 2.0.0.20. What will I need to do to upgrade to firefox 3.anything? I have tried pkg_add -r with  all the versions listed on the ports page but it is always "unable to fetch" them. When I just typed pkg_add -r firefox it told me I already have version 2.0.0.20 installed. So what do I do to get a more recent version?
            Steve