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Firefox will show you a "connection is not secure" warning message when a website login page is insecure and information could be stolen.
If a website requires a secure connection that cannot be established, Firefox will not connect and will show you an error page. Learn more.
This page explains the error: "Website will not allow Firefox to display the page if another site has embedded it"
Settings panels give you access to Firefox settings. This article describes what types of settings are available in each panel.
