Find out if you’ve been in a data breach
Stay safe with a simple yet powerful tool that tracks whether your personal information has been exposed in a data breach. We’ll help you understand what to do next and continuously monitor for any new breaches — all at no cost to you.
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Why use Firefox Monitor?
Identifying and resolving data breaches is an important step in ensuring your online privacy.
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Protect your accounts
Prevent hackers from getting into your accounts with breached passwords.
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Prevent fraud and cybercrimes
Keep your info away from hackers who want to impersonate you and commit crimes.
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Get alerts for new breaches
Find out whenever your personal information is compromised in a new known breach.
Here’s how it works
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Check for breaches
We’ll search all known data breaches since 2007 to see if your info was compromised.
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Protect your accounts
We’ll give you clear steps on what to do next for any data breach you’ve been involved in.
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Get alerts for new breaches
We’ll continually monitor for new data breaches and let you know if you’ve been affected.
Your privacy is safe with us
At Mozilla, the parent company of Firefox and Firefox Monitor, we believe individuals’ security and privacy on the internet is fundamental and must not be treated as optional.
Our mission is to build a better internet — one where people can shape their own experiences, feel empowered and stay safe. We’re wholly owned by the Mozilla Foundation, a non-profit, which enables us to put individual and public benefit over profit.
Top questions about Firefox Monitor
See all FAQsWhat exactly is a data breach?
A data breach happens when personal or private information gets exposed, stolen or copied without permission. These security incidents can be a result of cyber attacks to websites, apps or any database where people’s personal information resides. A data breach can also happen by accident like if someone’s login credentials accidentally get posted publicly.
I just found out I’m in a data breach. What do I do?
Visit Firefox Monitor to learn what to do after a data breach. Hackers rely on people reusing passwords, so it’s important to create strong, unique passwords for all your accounts. Keep your passwords in a safe place that only you have access to; this could be the same place where you store important documents or a password manager.
What information gets exposed in data breaches?
Not all breaches expose all the same info. It just depends on what hackers can access. Many data breaches expose email addresses and passwords. Others expose more sensitive information such as credit card numbers, passport numbers and social security numbers.