Rated 3 out of 5 stars

It works well, but the only time I get frustrated is when Firefox crashes and when it restarts, all the trees are mixed up and I have to spend a lot of time sorting them back together.

This review is for a previous version of the add-on (0.14.2014013001). 

Rated 5 out of 5 stars

Very nice. I don't really need the "tree style" function, but displaying tabs in a vertical fashion is quite useful for me. Firefox has become much snappier than when I was using multi-row to display tabs. After disabling the tree function in about:config settings, it is now much more convenient.

This review is for a previous version of the add-on (0.11.2011021901).