I had a Firefox session open and had maybe 50 tabs open. I am not signed in and have the browser set to restore previous session every time it is opened. When I last updated the browser, my laptop crashed and turned off before the restore session had opened the previous window. When I restarted it, it was gone and I accidentally closed that window too. This meant the next time I opened it, it restored THAT session and not the one with all the tabs I had accumulated (but not saved or bookmarked). The problem is that some of those tabs had been there for a year or more so it's not possible to fond them in my history folder. Is there a way to restore a PREVIOUS previous session in Firefox or are they gone forever?