Rated 4 out of 5 stars

There is a way to make it work under FF4. Go to your extensions directory and find the dir named {E19DF523-EFFD-48d2-95A2-883CB3BA32A4} - this is a QuietUrl folder. Next edit the install.rdf and change the 28 line to <em:maxVersion>4.1</em:maxVersion> - this will let the extension work (even with other extensions like Status-4-Evar).

This review is for a previous version of the add-on (