Google's Password Checkup extension for Chrome is being used by 650,000 people in the initial tests and it's showing over 316,000 as unsafe. The extension checks usernames and databases against a database of known thefts, and highlights this to the user.

Based on anonymous telemetry reported by the Password Checkup extension, we found that users reused breached, unsafe credentials for some of their most sensitive financial, government, and email accounts. This risk was even more prevalent on shopping sites (where users may save credit card details), news, and entertainment sites.

Google's full research is published here [ai.google...]

[security.googleblog.com...]

Google also said that the Password Checkup extension was updated to give users more flexibility in use, such as reporting.