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Rated 4 out of 5 stars
This is the safest way to save sessions in Firefox ATM, and it is a must for me now.
IMO it can still improve. In delete window, can't see the details, it confuse me cause I never name sessions. but in load window details can be check, so combine them(if possible, more windows or all windows) into one window, and allow right click or menu to delete and other actions. This will make things simple too : )
And if possible, could you change the icon?