Hi, I updated to Quantum (actually Firefox did it on its own), and since then the addon "session-manager" is no longer working. Until now I have been able to deal with the situation by always restoring the old session, until Firefox updated and by some unlucky chance it exited before I could restore my session. When I restored, it was only an empty session. I already identified the file I want to restore, which is in the \sessionstore-backups\ , and its name is upgrade.jsonlz4-20171128222554 , about 800 KB, and contains all the tabs I want. How do I rename the file and where should I copy it so that when I hit "restore previous session" it loads THAT FILE instead. I have tried renaming it to previous.js or restore.js, and copying it into the main directory, but it doesn't load it. The information I found on the Firefox forum seems outdated since I could not find the filenames they are talking about and I suspect this is due to the new version of Firefox, Quantum. Thank you in advance, regards, P. J. L.