Tree is lost on restart Rated 5 out of 5 stars

Thanks for this great extension!
But I experience one bug: with all-in-one sidebar extension, I lose tree hierarchy of my tabs on Firefox restart, only when AiOS sidebar is retracted.
Besides, is it possible to add a feature to integrate tabs bar in AiOS? According to AiOS developer ( http://firefox.exxile.net/forum_new/viewtopic.php?f=3&t=10125 ) the only thing to do is to use default Firefox sidebar.

This review is for a previous version of the add-on (0.14.2014051101.1-signed).