Firefox restoring tab session automatically

[beatle]

I was having issues with my Firefox performing slow, reloading tab sessions twice at startup, and other anomalies. I deleted my profile after backing up my bookmarks, then I downloaded all my extensions again fresh and started reconfiguring them. I've gotten to Tabbrowser Extensions (note, different from Tabbrowser Preferences) but I can't get it to reload my set of tabs automatically on startup. There is an option to do so, but checking it and applying it does nothing. I had it set up to do this before, but I can't find it for the life of me. See screenshots here:

Tabbrowser Extensions 1
Tabbrowser Extensions 2

 

[screw3d]

AFAIK Tabbrowser Extensions has even more issues than Tabbrowser Preferences..

Anyways Session Saver is probably what you are looking for

 

[beatle]

It looked like a good idea, but it just crashed Firefox.

Edit: put it in expert mode and changed a few things... now it works fine.