New Update has some bugs... Rated 4 out of 5 stars

The new update looks a lot better. Restoring sessions with trees in it now have arrows which indicate they are a tree. However there are lots of bugs that cause issues. Highlighting tabs and moving them to a new window caused issues.. didn't properly move. I saw one tab which was suppose to be on a tree at the top of the tab bar (vertically listed) instead at the bottom. Closing tabs took a long time and firefox eventually asked to stop the script because it was hanging. Blank areas in the tab bar where tabs should be. Lots of other issues. Has a lot of promise and the improvements are there, however.

This review is for a previous version of the add-on (0.14.2013040601).