Until one day when I forgot, I used to go through a rigmarole so that next time I booted up I resumed where I had left off with Firefox. I used to go Tools>Options>Main> Use current pages>OK. How many clicks is that?
If you don't do any of that but just shut down, next time you boot up, Firfefox politely tells you that your last session ended unexpectedly and 'do you want to resume where you left off? All you then need is ONE CLICK ......Can I have my £25 please ? .