Rated 5 out of 5 stars

Don't pay attention to s.c. 'reviews' by Biscuit1001 (who couldn't even find the toolbar buttons or menu items). By vvb Rrraven (who wrote:
"... The storage format looks like it was designed by drunken monkeys ..." - well, the format is written by mozilla kids, why complain here? To understand what you're talking about, should have clicked the links provided by developer and read about this extension). And, of course, by testcore (who - it looks like - posted garbage in a run by spite or just like the other two can't find his way out of a paper bag).

This is an excellent extension, very well supported through a dozen of years by now, loaded with options and works well.

To you, 'writers' i'd suggest learn to read before you write. Just above this review textbox, there's a site suggestion for a review which says among other things:
"Please do not post bug reports in reviews" . And the extension developer provided a link to the documentation (which is as complete as it can possibly be) and the thread where you can post any question you might have and/or report bugs (which usually are promptly fixed, BTW).

One of the best extensions out there, a must have i install first thing in every profile for years. Very highly recommend, nobody should browse without it!

This review is for a previous version of the add-on (0.8.1.8). 

Rated 5 out of 5 stars

Works very well, dev.builds are always available, has a truck load of options, easy to follow documentation with illustrations, change logs, well supported by a very responsive developer (just read the ongoing thread on Mozillazine forum).
Everything one would wish for in an extension.

This review is for a previous version of the add-on (0.7.9.5.1-signed).