After installing an update today the session restore for the latest version of FF did not restore all of the open windows and tabs. I have tried to restore the "Upgrade-js****" file in the sessionstore-backups folder but it too is incomplete and doesn't have all the windows or tabs. I do have a upgrade file from earlier but haven't tried it yet. What can I do? I have a college essay I am working on and now all my research tabs are gone.