Excelente, lo uso desde hace unos años ya. Hace lo que dice y es muy configurable.

Deletes cookies whenever you quit the browser works as expected

OK

This used to be a great extension, but it no longer works. Cookies from sites that are not on my whitelist are not being deleted. They remain after I restart Firefox and even after manually clicking the “clean” button.

Abandoned Extension; no updates in over a year and a half. Very hard to sync across devices if you use Container Tabs. Doesn't seem to be compatible with recent Firefox cookie changes; I found dozens of unexpected cookies which were not autodeleted.