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Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

Privacy and security

Security

Keep yourself secure online.

In English

Firefox Password Manager - Alerts for breached websites

Firefox security features warning on Linux

Control personal device and local network permissions in Firefox

Certificate contains the same serial number as another certificate

Block and unblock websites with parental controls on Firefox

Recommended Firefox privacy and security settings for families

Suspicious activity on my Mozilla account

Compatibility with Exploit protection on Windows

Sign in to a Mozilla account using 3rd-party authentication

Data Loss Prevention

Understand unexpected script warnings in Firefox

Harmful add-on protection

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