This extension is really nice! Thanks for making it happen! I'm on FF 57 beta right now and session management is pretty messed up. Without this extension I will lose my tabs every time I restart FF.

I found one problem: this extension would save and reopen private windows as well, which defeats the purpose of a private window. I hope there's a way to filter them out of the save, or at least out of the autosave.

A feature request: Is it possible to add a "remove all" button? Remove them one by one can be a pain at times.