You are mistaken, 8.1 update broke it, nothing changed on Mozilla's side. I've been using blinds with Win 8 since it came out for it and not a single time I had problem with Firefox/FDE until now (well nothing proper theme couldn't fix anyway). FDE won't even start into safe mode, nothing, it's completely obstructed by some new code in Blinds. If they fix it, it's all fine, bugs happen. But that message from Neil is not very customer friendly, perhaps they should avoid statements like "we don't support", without actually looking at what's wrong. Especially when problem is caused specifically by brand new version of Blinds.