Comment 16 for bug 58511

I forgot to check the obvious... This is a regresion in the default installation settings of fontconfig-setup. In all previous versions, bitmap files are *never* included by default, but in Edgy they are.

That is, if firefox finds bitmap fonts of the typefaces it wants, it obviously will use them. If not, it will use the next best thing (a substitute aliased in /etc/fonts.conf, be it a truetype or a type 1 font, whatever comes first).