Good Work Rated 4 out of 5 stars

Fantastic Add-on, but I have one bug on FF 3.0 with it.

When firefox is restarted, all my tabs are still there, but the tree layout is gone. Is this a bug, or is there an option that I am not seeing to fix this?
In FF 2 worked fine

This review is for a previous version of the add-on (0.7.2008062001).