Earlier quoted context omitted.
Don't know if it is still true. DNS lookup didn't work correctly when ipv6 was enabled.
W..what? I don't think this has been true for any Firefox version, ever. Certainly I'm using v6 right now. (Not on hn of course, it's v4 only)
Basically, the DNS lookup lasted like 4-5 times longer than it did while opening the same site in Chrome.