Mozilla is developing Firefox Monitor, a proposed security tool that lets users check if one of their accounts has been compromised in a data breach. The tool is designed for everyone, but offers additional features for Firefox users. Firefox will invite 250,000 users (mainly in the US) to try out the feature next week. Mozilla has partnered with HaveIBeenPwned.com to create Firefox Monitor. The site will offer recommendations on what to do in the case of a breach and how to help secure all accounts.”]
Source: https://blog.mozilla.org/futurereleases/2018/06/25/testing-firefox-monitor-a-new-security-tool/