FF3 again Rated 4 out of 5 stars

Great extension but nonfunctional at the moment. 5 stars -1 for lack of support. The fix suggested here a couple of times is nice and easy, and works for many simple extensions. But not for this one, does it? I've tried it several times, Firefox wants a restart, after which the extension should be usable but it isn't and it doesn't appear in Addons > Extensions. There is no error or version conflict, after all that's what editing the .rdf was about.