We have Windows 7 Professional, so my knowledge is almost certainly not typical, but I've previous versions from repair Points (see affixed). I cannot tell just what causes these correct Points, but i believe i acquired an update for something yesterday that could describe one of them.
Maybe it is obvious, but always tend to be right-clicking the "real" register within profile folder, and never the backup content.
Also, are you experiencing the unique file developed throughout the Firefox 31 update (sessionstore.bak-datetime)? That might be the most up-to-date one available if absolutely nothing else pans away.
We have Windows 7 Professional, so my experience may possibly not be typical, but I've earlier incarnations from Restore Points (see connected). I can not inform exactly what triggers these improve Points, but I think i obtained an update for anything yesterday that could explain one. Maybe this really is apparent, but always tend to be right-clicking the "real" register inside profile folder, and never the back up copy. Also, do you have the special file developed during Firefox 31 improvement (sessionstore.bak-''datetime'')? That would be the most up-to-date one readily available if nothing else pans on.