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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.
This page explains the error: "Website will not allow Firefox to display the page if another site has embedded it"
Firefox automatically updates itself by default, but you can always do a manual update. Learn how to update Firefox on Windows, Mac, or Linux.
Settings panels give you access to Firefox settings. This article describes what types of settings are available in each panel.
