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Captive portal detection
Page that describes how Firefox detects captive portal networks.
What do the security warning codes mean?
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.
How to change your default browser in Windows
Learn how to make Firefox your default Web browser on Windows 10 and Windows 11.
How to troubleshoot time related errors on secure websites
Learn why you might see time-related errors on HTTPS websites and how you can troubleshoot these errors by correcting your system clock.
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