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

Performance and connectivity

Site breakages

Resolve problems when websites don’t load or function correctly.

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Troubleshoot time-related errors on secure websites

Fix error “Website will not allow Firefox to display the page.”

Troubleshoot security error codes on secure websites

Firefox can't load websites but other browsers can

Configure firewalls so that Firefox can access the Internet

Websites don't load - troubleshoot and fix error messages

Resist Fingerprinting

How do I report a broken site in Firefox desktop?

Websites look wrong or appear differently than they should

Firefox and other browsers can't load websites

Fix login issues on websites that require a username and password

Fix problems connecting to websites after updating Firefox

Fix problems with Facebook games, chat and more

Troubleshoot issues related to add-ons

Websites show a spinning wheel and never finish loading

Websites say that Firefox is outdated or incompatible even though it's the latest version

TLS Error Reports

Difficulties opening or using a website in Firefox 100

Problems with email and how to find help

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