Lite weight and very handy. Rated 5 out of 5 stars

iIs an exceptionally light add-on. Double click on the focused tab and it closes all other tabs but the one focused.
Its really handy if you are skimming thru Twitter and don't want alot of tabs open... and it can get you out of a jam if you accidentally open to many tabs at once.

This review is for a previous version of the add-on (1.02).