Firefox Password Manager - Alerts for breached websites

Firefox, Mozilla Monitor Firefox, Mozilla Monitor Last updated: 02/07/2024 58% of users voted this helpful
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The 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. Select Learn more to read details about the breach on Mozilla Monitor.


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. The database of breached websites is provided by Have I been Pwned.

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: Firefox never sends your logins or passwords to third-party services or servers. It keeps all data regarding logins and breaches anonymous.

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.

  1. In the Menu bar at the top of the screen, click Firefox and then select Preferences or Settings, depending on your macOS version.Click the menu button Fx89menuButton and select Settings.
  2. Select the Privacy & Security panel on the left and scroll down to the Logins and PasswordsPasswords section.
    Fx111settings-LoginsAndPasswordsFx111settings-LoginsAndPasswordsWin10Passwords panel - not simplified
  3. Deselect the checkbox for Show alerts about passwords for breached websites.
To see if your email address was part of a breach, sign up for Mozilla Monitor.

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