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If a website requires a secure connection that cannot be established, Firefox will not connect and will show you an error page. Learn more.
Firefox issues an insecure password warning when a web page's login form is not secure and your information could be stolen.
Options/Preferences panels give you access to Firefox settings. This article describes what types of settings are available in each panel.
Learn why you might see time-related errors on HTTPS websites and how you can troubleshoot these errors by correcting your system clock.