Mozilla announced the release of Firefox Monitor, a free tool that allows you to see if your email address was included in known data breaches.  This service will not store your email address unless you subscribe to it so you can be notified of future data breaches that use your email account.

Firefox Monitor was developed as a collaboration between Mozilla and security expert Troy Hunt of HaveIBeenPwned.com (HIBP).

This Mozilla security tool is available at monitor.firefox.com.