Rated 5 out of 5 stars

It's THE best marker addons of all -- simple and not overbloated, functional but without bells and whistles and blackjack. It allows to 1) make marks, 2) save them for future and 3) share them via simplest way (url). Unfortunately it doesn't work on a current FF.

This review is for a previous version of the add-on (0.6).