Rated 5 out of 5 stars

Από τον/την Mitochondrial Steve στις Αύγ. 16, 2011 · μόνιμος σύνδεσμος

This is an excellent add-on, and it would be nice if the developer updated it properly. The reason it keeps declaring itself incompatible with Fx5 is that the maxVersion in install.rdf is actually set to 4. If you fix this yourself it works fine. The puzzling thing is why it will even install in the first place.