I'm working on setting up my new laptop and some process wanted me to restart Firefox (I think it was after removing McCaffee). When it restarted, the windows and tabs from my previous session did not get restored. I tried the solution here: Lost session (previously open tabs gone) but it doesn't give a complete answer! I found the "working files" as indicated but then the answer doesn't say what to do! Getting everything from my old computer to this new one is torture enough; this glitch on Firefox is enough to make me want to just trash it or wipe it and go back to Windows 10.