PoBoy
Juggernaut
https://www.servethehome.com/firefox-is-eating-your-ssd-here-is-how-to-fix-it/
TL;DNR
TL;DNR
After some digging, I found out that this behavior is controlled by a parameter that you can access through typing “about:config” in the address bar. This parameter is called: —browser.sessionstore.interval
It is set to 15 seconds by default. In my case, I reset it to a more sane (at least for me) 30 minutes. Since then, I’m only seeing about 2GB written to disk when my workstation is left idle, which still feels like a lot but is 5 times less than before.