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Firefox Aurora 18 supports Retina now, and Firefox Beta 18 will support it when it's released later today or tomorrow.

What do they need to do special for retina displays?

Firefox has its own font rendering, it displays horribly with retina scaling. See for example http://media02.hongkiat.com/mbp-retina/chrome-vs-firefox-vs-...

It may seem picky, but its very obvious when browsing.

That screenshot looks less like "Firefox displays horribly with retina scaling" and more like "everything other than Safari displays horribly with retina scaling."

Which Apple may consider a feature rather than a bug :-D

That picture doesn't do it justice, Chrome looks significantly better than Firefox.

It's an old screenshot from before Chrome got Retina support.

I've been running nightly (19.0a1) for weeks just for the retina support with no issues. Their nightly is surprisingly stable.

Alternatively you can go to about:config and set layers.acceleration.disabled to true.