<-- More Scrolling --> Rated 3 out of 5 stars

This turned out to not be as useful as I had hoped. True you see more add-ons vertically, but this comes at the expense of having to scroll horizontally to activate, deactivate or remove some add-ons depending on how long their titles are and on the available screen real-estate (@ 1024 horiz. resolution this becomes arduous).
I had hoped this function would reduce the (by default) ENORMOUS amount of blank space (to the left of the add-on list) and HUGE lettering Mozilla introduced into the add-on manager for TB and FF.
SAM is useful when size reducing [CTRL-] the add-on manager, but this setting is unfortunately not saved in TB/FF. SAM could improve on this by saving the last zoom setting or by carving away the gaping chasm between the add-on categories on the left and the add-on list on the right.

This review is for a previous version of the add-on (9.1-signed).