Doesn't work in FF 4.0 Rated 1 out of 5 stars

Maybe it conflicts with some other add-on but for me in Vista with FF 4.0 it simply produces empty windows. Worse, it seems to cause havoc when closing those windows - it closes windows in the background that I wanted to stay open. Struggled with it for a couple of days but now it is removed.

This review is for a previous version of the add-on (2.2.1-signed).