It looks like the prefs code was changed so that math fonts could be specified and lang="x-math" specified on elements. The problem with the implementation is that this wasn't added to the list of lang groups tracked within gfx code, so any gfxFontGroup with lang=x-math won't pick up the right pref fonts. After recent changes, there just needs to be a line added to gfxFontPrefLangList.h and a few tweaks to all.js.

Comment on attachment 8662716 [details] [diff] [review] patch, fix up font prefs for x-math lang group Review of attachment 8662716 [details] [diff] [review]: ----------------------------------------------------------------- It'd be good to assert the comment at the top of gfxFontPrefLangList.h (that the list must be in sync with the prefs). I'll see what I can do about that in a separate bug.