Privacity-cookies blockers no works

Hi, I ask you for help: since the last update (v 60.0.2) the FF has serious problems on the settings (privacy/cookies), that if I blocks sites on the “exceptions”, this nothing blocks and the worst: if I opt for “keep cookies until … leave firefox”, nothing works. I leave the FF, I go back again and nothing of cookies have been deleted. In the previous version everything worked. What happens? What to do? Or only with me this occurs? Please, help. thanks