Doesn't show any currently open tabs.

Man I love the cloud save feature! I thought I lost my sessions after erasing my PC but then I remembered to sign in and sync from the cloud. Awesome!

Has the potential to be(come) great, but for now not useful - for me.

You cannot drag closed tabs to different window.
You cannot drag windows to a different session.
Sessions can't be organized in folders.

Tags for sessions are useful, as you can filter them. This is nice.
Auto-track change option is also a good idea, but it has to be activated for each session individually - it seems.

For now it seems a good extension for people who want session syncing for sessions containing multiple windows.
People who want to sync WINDOWS (1 window = 1 subject) will find this extension less useful.

always have been the best since years... Thanks a lot for all the time you make me save !!

Страшно удобно и надеждно допълнение към моят Firefox. Запазва отворените ми сесии и много табове и прозорци без проблеми и ги зарежда отново ако ги затворя изключително бързо.

Amazing extension!

This is only good for interacting with closed sessions - it's not useful for interacting with your current session. E.g. if you keep a large number of windows & tabs open & need help navigating between them, this won't help: Clicking on a tab or a window will open a NEW INSTANCE of that tab or window (which is absolutely not the default behavior I'd look for).

The feature to sync sessions looks like it could potentially be useful - it improves on the current open-tabs sync functionality by giving access to archived sessions. (Which I suppose is the one area where it's useful, but it's not remotely a common use-case for me.)