I had to quit Firefox this morning because of a problem with my proxy and when it reopened it had updated to Firefox 139. In the process, I lost my entire browsing history and all open tabs from my previous session. Although in settings I have "Open previous windows and tabs" selected always, when Firefox restarted the browsing history was empty and "Restore previous session" was not an option under history, nor were "Recently closed tabs" or "Recently closed windows." I cannot locate any backup files in the Firefox library on my computer (MacBook Air running Ventura 13.7.5). I really need to be able to restore the previous session, please let me know if this is possible.