What is Firefox?

A free and open source web browser developed by The Mozilla Foundation and its subsidiary, Mozilla Corporation. Firefox is available for Microsoft Windows, MacOS, Linux, BSD, and more.

See what’s being blocked

Firefox shows you how many data-collecting trackers are blocked with Enhanced Tracking Protection.

Make your passwords portable

Firefox Lockwise makes the passwords you save in Firefox secure and available on all your devices.

Watch for data breaches

Firefox Monitor alerts you if we know your information is a part of another company’s data breach.