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

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What Windows 10 end of support means for Firefox users

What Windows 10 end of support means for Firefox users

Learn how Firefox will continue supporting Windows 10 after Microsoft ends its updates, and discover the steps Mozilla recommends to keep your browsing experience secure.

Use widgets on your Firefox New Tab page

Use widgets on your Firefox New Tab page

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Captive portal detection

Captive portal detection

Description of how Firefox detects captive portal networks.

Secure connection and security warning error pages in Firefox

Secure connection and security warning error pages in Firefox

If a website requires a secure connection that cannot be established, Firefox will not connect and will show you an error page. Learn more.