Firefox Monitor


Take your stand against an industry that’s making you the product.

Find out if you’ve been part of a data breach with Firefox Monitor. Sign up for alerts about future breaches and get tips to keep your accounts safe. Most people have about 100 online accounts. About Firefox Monitor. Firefox Monitor warns if your online accounts were involved in a data breach. Find out if you’ve been in a data breach, get alerts about new breaches, and take steps to protect your online accounts. Firefox Monitor is provided by Mozilla.

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See if you’ve been involved in an online data breach.

Meet our family of privacy-first products.

Get it all on every device, without feeling trapped in a single operating system.


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Get the respect you deserve.

You’ll always get the truth from us. Everything we make and do honors our Personal Data Promise:

Take less.
Keep it safe.
No secrets.

Get the knowledge to keep you safe.

Learn everything you need to know (but don’t yet) about staying smart and safe online, from some of the world’s foremost experts.

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And be part of protecting the internet for future generations.

Help us build a better Firefox for all.

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Get into the open source spirit by test-driving upcoming products.

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Help us keep Big Tech in check.

We support communities all over the world standing up for a healthier internet. Add your voice to the fight.