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Firefox shows you a warning page about a potential security risk when you try to connect to a secure site but your connection is not secure.
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.
Learn why you might see time-related errors on HTTPS websites and how you can troubleshoot these errors by correcting your system clock.