Firefox Fonts Trouble

Has anyone besides me found, that firefox has been displaying sans-serif fonts as serif-bold fonts lately? Is that a bug or a feature? It sucks majorly. All layouts broken. I am really not a fan of Times New Roman.

And guess what: same trouble on my windows box.

edit: I should have known the bug would be fixed the minute I decide to finally publish this annoyance. apt-get is my friend. well at least on debian an update fixed the problem.