Firefox Lockwise - Alerts for breached websites

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This article applies to Firefox version 70 and above.

The Firefox Lockwise Password Manager 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 about this breach to read details about the breach on Firefox Monitor.

Alerts for breached websites in Firefox Lockwise76 password breach

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.

Starting in Firefox version 76, Firefox will also check to see if you’ve reused any of these potentially vulnerable passwords with other logins you’ve saved to Lockwise. 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 in Lockwise

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 select Preferences. Click the menu button Fx57Menu and select OptionsPreferences.Click the menu button Fx89menuButton and select Settings.

  2. Select the Privacy & Security panel and go to the Logins and Passwords section.
    Fx80settings-LoginsAndPasswords
  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 Firefox Monitor.

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