https://techcrunch.com/2018/09/25/mozillas-firefox-monitor-will-now-alert-you-when-one-of-your-accounts-was-hacked/

Earlier this year, Mozilla announced Firefox Monitor, a service that tells you if your online accounts were hacked in a recent data breach. All you have to give it is your email address and it’ll use the Have I Been Pwned database to show you if you need to worry and what data was compromised. Today, Mozilla is taking this a step further by also letting you sign up for alerts for when your accounts appear in any (known) breaches in the future.

When it first launched, Mozilla considered Firefox Monitor an experimental service. Now, it’s being launched as an official service.