The latest Firefox update modified the privacy and history settings in a worse way, completely ignoring the website exceptions saved by the user.
Even though I correctly added websites (like Google, Facebook, and WhatsApp Web) to the "Manage Exceptions" list with "Allow" status, the browser forcefully logs me out of every account upon closing. This happens because the global option "Clear history when Firefox closes" overrides everything by default. To fix this, users are forced to manually open the "Settings..." sub-menu and uncheck "Cookies" and "Active Logins" just to keep their sessions alive. Please make sure that user-defined exceptions take absolute priority over global cleanup rules again.