I have to say, I'm vastly unimpressed with Firefox having apparently fucked something in their APIs over the space of a point release update. Dirty pool.
I'll update again when I have a new release. Just to warn you all, though, I'm currently only aiming to fix this problem; I haven't yet gotten it in me yet to tackle all of the other cross-extension incompatibilities and wanted features yet. (If anyone else cares to tackle any of these, however, I do accept patches. :-)