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.