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

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Article Visits Status Needs Update Ready for L10N Stale Expiry Date
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Review Needed: Updated outdated troubleshooting steps, added modern guidance for Troubleshoot Mode, VPNs and DNS-over-HTTPS, improved proxy and site-data instructions, and removed obsolete about:config DNS and IPv6 advice. Yes Show translations
Captive portal detection 289,938
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Use built-in VPN in Firefox 277,155
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Secure connection and security warning error pages in Firefox 273,250
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Set Firefox as your default browser on Android 260,641
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Thunderbird and Junk / Spam Messages 181,728
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Insecure connection password warning in Firefox 170,658
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About private browsing in Firefox for iOS 151,136
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Firefox settings, preferences and other options 135,978
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Update Firefox to the latest release 131,119
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