That combined with Firefox Containers would make for a very powerful combination since you could have different containers that would be your logged-in interface to a specific site, without then having to allow other sites be able to set cookies.
> Delete cookies and site data when Firefox is closed
setting checked in preferences. There is a Manage Permissions button next to it that allows some more per-website control.
Websites can place however many cookies they want. It won't help them track me past a day.
Setting up Safari this way and using FireFox only with containers for each major web platform works really well for me and I have been able to talk non tech friends into trying it.
Whitelist a site and set default behavior to block will still allow that whitelisted site... I think so at least, maybe you need wildcards or something...