Works great on Firefox 8.0 Rated 5 out of 5 stars

Works great - simple and does exactly what it says it will do. Works fine on Firefox 8.0 - all you have to do is to bump the .xpi file before installing. Unpack the xpi with Winrar or somethings similar, open the install.rdf file and change the Firefox maximum version to whatever you are using. Save everything and then install.