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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

Troubleshoot network errors when TLS key logging is enabled

Control personal device and local network permissions in Firefox

Firefox Password Manager - Alerts for breached websites

Firefox security features warning on Linux

Use breach alerts in Firefox

Unable to find the built-in VPN in Firefox

Certificate contains the same serial number as another certificate

Block and unblock websites with parental controls on Firefox

Suspicious activity on my Mozilla account

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

Data Loss Prevention

Harmful add-on protection

Compatibility with Exploit protection on Windows

Recommended Firefox privacy and security settings for families

Use built-in VPN in Firefox

Understand unexpected script warnings in Firefox

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