Debian unstable now has iceweasel.

Running iceweasel presented me with the pretty message

You've Updated To The Latest Version of Firefox

Great.

Note: Ubuntu has more patches to firefox than Debian, so if Debian is (or: was) violating Mozillas trademark, so is Ubuntu. And probably Fedora. And Redhat. And Gentoo (well, maybe not; from what I know Gentoo is closed to unmodified upstream usually, and not as anal about LSB and desktop integration etc. as the others), ... you name it.

Anyway, go, iceweasel, go.