The Password Checkup extension helps you resecure accounts that were affected by data breaches.
Wherever you sign-in, if you enter a username and password that is no longer safe due to appearing in a data breach known to Google, you’ll receive an alert. Please reset your password. If you use the same username and password for any other accounts, please reset your password there as well.
Password Checkup was built with privacy in mind. It never reports any identifying information about your accounts, passwords, or device. We do report anonymous information about the number of lookups that surface an unsafe credential, whether an alert leads to a password change, and the domain involved for improving site coverage. You can learn more about how Password Checkup works at https://support.google.com/accounts?p=password-checkup.