Comment 4 for bug 197781

I've just run into this bug. It's serious.

A separate extension was making calls to loadOverlay, causing the call in my extension to fail. It just happened to squeeze in first. Thus, sections of functionality were just plain missing.

For what it's worth, still in 2.0:

Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.8.1.1) Gecko/20061204 Firefox/2.0.0.1