[jimktrains2]

Interesting. I've never had an issue with the built-in session restore functionality. I'm not dismissing you, but asking what issues you've had with it (so that I can watch out for them.)

[Kliment]

Sometimes, usually after a crash, firefox will restore an empty session. Session manager has a working backup in those cases.

[beezle]

the add on can make multiple dated session stores and you can pick which to restore from.