Please go to the History section in about:preferences#privacy, under settings you can uncheck "active logins". That should solve the problem. Since [Bug 1770881](https://bugzilla.mozilla.org/show_bug.cgi?id=1770881) active logins will not be automatically set anymore when selecting "Delete cookies and site data". Please report if the Problem still exists after unchecking the active logins checkbox.
Bug 1771024 Comment 4 Edit History
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Please go to the 'History' section in about:preferences#privacy, under settings you can uncheck "Active logins". That should solve the problem. Since [Bug 1770881](https://bugzilla.mozilla.org/show_bug.cgi?id=1770881) active logins will not be automatically set anymore when selecting "Delete cookies and site data". Please report if the problem still exists after unchecking the active logins checkbox.