http://bugs.winehq.org/show_bug.cgi?id=12307
--- Comment #18 from Austin English austinenglish@gmail.com 2008-08-18 20:36:18 --- (In reply to comment #16)
Probably there are two bugs to fix: Wine should not crash on bad glyph indices (symptom), and also Firefox should not provide bad glyph indices at all (cause). Wether the latter is a Firefox or a Wine bug is yet to be determined.
While it is a bug on Firefox's end to send the bad glyphs, if windows handles it fine, Wine should as well.