Previously you could find the data for your last Safari session in ~Library/Safari/LastSession.plist This file still exists on Monterey, but Safari doesn't seem to reference it or pull from it anymore. I have replaced the contents with a previous session, and none of it comes up when I use History>Reopen All Windows from Last Session. Instead, a totally different session opens in Safari - but I have no idea where this data is stored. I want to open a previous session in Safari, but since it isn't using LastSession.plist, I'm stuck! Does anyone know where Safari in Monterey stores session data?