when signed out it wont work

https://addons.mozilla.org/ru/review_guide

This is a serious Single/Group Tab saver. Customizable, it's great!

Can't do without it now. Sure it can use improvements, but a really great start.

great add on to save sessions please developer don't fuck up the add on is great as it is!

Bloody brilliant stuff. Thank you :)

amazing. bugged me at the end of december, re-installing fexied the issue. very good app otherwise

Works really well, although need to understand settings and that Firefox now has a similar feature biult-into itself, which saves users from many annoyances or even troubles.

Good to have both if closing browser with many windows happens often to you.