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Firefox
Performance and connectivity

Performance and connectivity

Deal with error messages, crashing applications, connectivity issues, and slow performance.

In English

Captive portal detection

How to troubleshoot time related errors on secure websites

Connection settings in Firefox

How to troubleshoot security error codes on secure websites

Manage the devices linked to your Mozilla account

What do the security warning codes mean?

Firefox DNS over HTTPS

Firefox can't load websites but other browsers can

Resist Fingerprinting

How to let Firefox use the internet on your Windows computer

DNS over HTTPS (DoH) FAQs

Browsing history in Firefox - View the websites you have visited

Firefox blocked by macOS 15 Sequoia firewall - What you need to know

Disable Firefox Sync

HTTPS-First upgrades to secure connections

Server Not Found - Troubleshoot connection problems

How to resolve weak crypto error messages on Firefox

Address screen sharing issues with Firefox on macOS 15 Sequoia

Bug 1931078

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