Who’s Hacked Your E-mail Address?

Check out Monitor, a service from Firefox, that checks your email address against a database of publicly known data breaches.

You can also sign up to get a report every time there is a new security breach to let you know whether your account has been compromised or not.

https://www.fastcompany.com/90241330/firefox-has-users-to-thank-for-its-new-security-feature