Since you brought up logging out and in, remember that Firefox Containers are very useful for things you wanna let logged in all the time (e.g., Facebook, maybe Google) so their tracking gets a little worse because your cookies are more isolated.
Multi-Account Contaners lets me set up permanent containers for (groups of) sites I want to stay logged in to. I check the "always open this site in <container name>" box.
Temporary Containers is set up to open new sites (on middle / control click) in new, temporary containers. These containers work like private browsing windows, but store their data for 10 minutes after being closed. So undo close tab works, history works, but each new site is in its own container. And 10 minutes after its closed (or when the browser as a whole closes) all the cookies get deleted.
[0]: https://addons.mozilla.org/en-US/firefox/addon/cookie-autode...