please, add backup, because one addon damaged my installation, i had to reinstall firefox and all my tab sessions were gone...

Seems good so far. Would be nice to be able to switch to a monochrome icon to fit in with Quantum's design. Also it would be great if you could easily replace the content of a saved session with the current one - this seems possible by re-saving with the same name, but this is cumbersome.

Another thing - when you click a saved session in the UI, there is no way to go back to the current session

One more thing - are sessions stored in a file? It we be good to be able to specifiy the file location if so, so that taboo sessions could be synced between computers using Dropbox for example

I've added these as issue in GitHub :)

Seems to work on mobile, but I'm not sure how to transfer the sessions to desktop. I'd really prefer it if the sessions could be saved in a universally accessible/editable format like txt or html.

1. Сохраняет вкладки как сессию, при этом имя нужно вручную задавать
2. Загрузка сессии только в новом окне
3. при закрытии окна сессия не сохраняется автоматом как было в Session Maneger

This addon is very good and very nice.
But the only thing which would make this addon perfect is the automatic backup of session.
Indeed, this addons doesn't allow to restore the last state if you didn't save your sessions manually... But We never know when Firefox will crash...
I'm really waiting for this feature...
I'm using MySessions addons until this addon implements the automatic saving.