Comment 10 for bug 528139

Turns out it's not cleared up, and I don't think it's invalid - looks to be a firefox upgrade bug.
http://support.mozilla.com/nl/forum/1/562036?forumId=1
has some other descriptions and people have the issue on OSX, windows, and linux... Clicking restart in the extensions area works with any/all of the previously installed extensions, closing firefox and launching again does not. I suspect profile damage rather than extension incompatibility. For now I'm just running without extensions, but I'll probably create a new profile and see if I can get them to consistently run again.