There was no sessionstore file in my profile and the sessionstore backups folder did not have a previous sessionstore file either. The only files in the backups folder were; recovery.jsonlz4 recovery.baklz4 I checked these out on the link below but they only had tabs for the current session, not the previous session. https://www.jeffersonscher.com/res/scrounger.html I lost many open windows and tabs which I need. Please help. Previously, I could click on the restore previous tabs button and my previous windows would open up, I did not get that option this time. I have firefox updating automatically and this must have happened after the last update. Frustrated user.