Rated 5 out of 5 stars

It does work in FF3.

-Download the xpi to your HD
-Open with winrar (xpi is just a zip file)
-Extract install.rdf to desktop
-Edit install.rdf: look for 2.0.0.* and change it to 3.0.0.*
-Delete instal.rdf in the xpi from winrar
-Drag the install.rdf you edited back in the xpi
-Open the Add-Ons window in FF and drag the xpi into it
-Viola!

This review is for a previous version of the add-on (3.0.2).