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Learn how to make Firefox your default Web browser on Windows 10 and Windows 11.
Firefox automatically updates itself by default but you can always do a manual update. Learn how to update Firefox on Windows, Mac or Linux.
If a website requires a secure connection that cannot be established, Firefox will not connect and will show you an error page. Learn more.
We'll explain errors such as "Server not found" or "Unable to connect" and how to fix problems where Firefox can't access websites but other browsers can.