If you’re ipv6 enabled, stuff the following into your hosts file and let me know how it goes.
2620:0:330:5::10 www.mozilla.com 2620:0:330:5::11 www.mozilla.org 2620:0:330:5::31 addons.mozilla.org
It might even be faster (since you’re probably the only one using those machines)!

Comments (3)
I don’t see a difference. But that’s probably a good sign …
Hm. I wonder how I would become IPv6 enabled — the average DSL provider (or university) don’t seem to offer that. :-/
@Frédéric Wenzel:
If you are behind NAT, Teredo. If you are not behind NAT, or you control your router that does NAT in IPv4 and it supports it, use 6to4.