I know by experience that the key isn't about refusing them, but letting them having those "user accepted" KPI values, even if it goes nowhere behind.
But that's mostly just a habit of mine that I know is pretty useless, as websites don't need cookies to track you, and I really don't know why they even bother anymore.
It's excellent. I have needed to disable it occasionally to make basic site functionality work on some sites that I absolutely need to use, though I'm forgetting which ones.
https://www.androidpolice.com/i-dont-care-about-cookies-acqu...
Don't bother with this extension as it can't delete other storage locations where there is persistant storage. Also Firefox has TCP, Total Cookie Protection so you don't need them anyway.
https://blog.mozilla.org/security/2021/02/23/total-cookie-pr...
Better to just sanitize on close https://www.privacyguides.org/desktop-browsers/#sanitize-on-... and maybe keep history.
If you want to keep persistent logins then whitelist those specific cookies to those specific sites or use a password manager.