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joystmp In Firefox about:preferences#privacy, under Cookies and Site Data heading, you'll find Delete cookies and site data when Firefox is closed with Manage Exceptions beside it.
This option looks like this:
I like it because Firefox will automatically clear cookies, cache, third-party data of the first-party site, etc. of all websites once I close it. I can add websites I want to allowlist under Manage Exceptions
.
That way, I don't have to constantly re-login back into sites I use every day, while deleting less frequented site data.