this is a goood one . . . Rated 5 out of 5 stars

I hope that this gets updated for ff3.5
It is small and useful - many of the other extensions of this type rely on a lot of graphics and thumbnails and so are less useful when more than more that 7 or 8 tabs are open

This review is for a previous version of the add-on (1.1.2008042801).