Mozilla Foundation engineers are working on one system notifications for Firefox, which will display security warnings to users visiting websites that have suffered data breaches.
The alert system will use the data contained in the Have I Been Pwned, a website that includes all known data breaches and features a search for users who wish to see if their personal information is included in said breaches (name, Password). 
Jobs for this project have just begun, and the source code for displaying these warnings is not even included in the basic Firefox code but works separately as an add-on.
“The [Notices infringementς ή Breach Alerts] είναι ένα addon που πρόκειται να χρησιμοποιήσω για τη δημιουργία πρωτοτύπων ενός επερχόμενου χαρακτηριστικού στον Firefox που ειδοποιεί τους χρήστες όταν τα διαπιστευτήριά τους έχουν εμπλακεί ενδεχομένως σε κάποια παραβίαση δεδομένων”, αναφέρει ο mechanical by Mozilla's Nihanth Subramanya in the add-on description.
The code of this add-on is available in GitHub and anyone who wants it can do a compile to get it to Firefox. Please note that only Firefox Developer Edition is currently supported.
The plugin is still in the early stages of development and warnings are currently triggered when the user visits a website that is included in its public data breach list Have I Been Pwned.
This new warning system will surely shake off the companies that have been tampered with. Have I Been Pwned can offer the same service, but it's not the same. It's very different to display this information from a browser that uses millions of users and shows violations that have happened years ago.
"I'm working with Mozilla on this," said Troy Hunt, the researcher behind Have I Been Pwned.
"We're looking at a few different models of how it might work, but the main achievement is that we intend to display warnings about data that has been directly exposed by the browser," says Hunt.
One thing is for sure that the Mozilla Foundation should pay special attention to how it will display the warnings. It should focus less on the security incident and put more emphasis on encouraging users to change their credentials on infringing websites.
See the add-on Breach Alerts
