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Firefox's password management will show you alerts about logins potentially exposed in data breaches and passwords that may be vulnerable.

The [[Password Manager - Remember, delete and edit logins and passwords in Firefox|Firefox password management feature]] shows alerts about logins that were potentially exposed in data breaches. If it’s likely that one of your saved logins was exposed in a known data breach, you’ll see this alert with its associated login. [[Image:FirefoxPasswordBreach]] =How Firefox notifies about website breaches= Firefox checks the date of a known website breach against the date you saved a password for that website. If the website was breached after you saved your password, you’ll see this alert. Firefox will also check to see if you’ve reused any of these potentially vulnerable passwords with other logins you’ve saved to Firefox. The browser does this by creating an encrypted list of your breached passwords, then checking it against all saved passwords. Firefox does not keep logs of your plaintext passwords or know them. {note}'''Note:''' Firefox never sends your logins or passwords to third-party services or servers. It keeps all data regarding logins and breaches anonymous.{/note} =Turn off website breach alerts= Disabling the feature also prevents Firefox from checking to see if you’ve reused these potentially vulnerable passwords on any of your other saved logins. # [[Template:optionspreferences]] # Select the {menu Privacy & Security} panel on the left and scroll down to the {for not fx122}''Logins and Passwords''{/for}{for fx122}''Passwords''{/for} section. #;{for not fx122}{for mac,linux,win7,win8}[[Image:Fx111settings-LoginsAndPasswords]]{/for}{for win10,win11}[[Image:Fx111settings-LoginsAndPasswordsWin10]]{/for}{/for}{for fx122}[[Image:Passwords panel - not simplified]]{/for} # Deselect the checkbox for '''Show alerts about passwords for breached websites'''. {note}To see if your email address was part of a breach, sign up for [https://monitor.mozilla.org/?utm_medium=mozilla-websites&utm_source=support.mozilla.org&utm_campaign=password-manager&utm_content=sign-up-banner- Mozilla Monitor].{/note}