Loved it but... I have many sessions named and saved to continue working/learning on those topics. Yet once one of the sessions is modified (like closing some tabs or adding others) it is not updated where you saved (as it fluidly works in similar extensions), it is only stored under "active session". Even if you manually save it, it will do it as another new session, not with the name you initially saved it, which totally ruins the purpose of it (at least for me)... Any chance you fix this soon?

EDIT (response to response 1): Yes I can overwrite the session. Problem is that the original session is not selected/highlighted by default, so I have to find out which one could it be. In many occasions this is too cumbersome even though I name almost all of them, and if I have changed all or many of the tabs, it could even be impossible.
Also, when I close a tab is because I don't want it in the session, same as if I keep a tab open is because I want it in the session. That's what sessions are. If didn't want to be adapted to my session (if wanted them permanently stored) I would save them as a bookmark. You can open all bookmarks in a folder at the same time, so why would anyone need a session that is just a bookmark folder?
Anyway, having it as an option, even if not default, would be good enough. And in case it helps doing it by little by little, before implementing the automatic saving, it'd be great that the add-on highlighted the current window-session under "sessions". This is more important than the automatic saving, although for the experience to be complete as in others (at least in other browsers -let me know if you want me to give you some examples), automatization would clearly easy things more. Saving it just when closing the window would be enough. But again, being able to overwrite the session when I want with a keyboard shortcut that saves it with the name it was already created would be a very useful first step... Thanks for listening!