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Google plans to add a hacked-password alert system into its browser by the end of year; Firefox aims to do much the same thing this month. Learn more in an informative Computerworld article:

Google has launched a web-based hacked-password checker, part of its efforts to bake an alert system into Chrome.

Called "Password Checker," the service examines the username-password combinations stored in Chrome's own password manager and reports back on those authentication pairings that have been exposed in publicly-known data breaches.

The web version can be found at passwords.google.com<>, the umbrella site for Chrome users who run the browser after logging in with their Google account, then use that to synchronize data - including passwords - between copies of Chrome on different devices.