[karmic regression] all network apps / browsers suffer from multi-second delays by default due to IPv6 DNS lookups

[Martin Olsson]

I just wanted to get this bug on the release radar
since it's pretty severe (it makes all web browsing
very slow for a large group of users).

Worst case maybe we can ship about:config with a default of:
network.dns.disableIPv6 == true

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/417757