If you use CCleaner with all options selected, even Chrome and Edge not log out you from browser, you still have sync, but you just only verify your identifity. In Firefox, after use CCleaner on all options, you are logged out pernamently and you must log in again, using your credintials like password and 2FA, it's so bad for me, i can't free up space on disk because Firefox sync log out after cleaning data in browser.
Secondly, maybe Firefox add system to login as QR code, just using QR code in mobile app or account login page, and verify by 2FA code or email check, that was quicker and more safier.
