If you want to keep groups of tabs in different windows and come back to them easily, this is it.

горевал что в мозиле отключили группировку вкладок, а тут еще удобнее и функциональнее! особенно когда у тебя 1к+ вкладок) да еще все можно восстановить из бекапа!

beware that current version (52) is broken in firefox 121

thank you Drive4ik

it's nowhere near perfect, but it is far better than the few other extensions for this kind of workflow. if you work on it a bit you can get it to do what you want.

This add-on simply become must have add-on for me.

Not sure why so many reviews are saying this is hard to use. I found it easy and simple to setup and start using.