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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.
If a website requires a secure connection that cannot be established, Firefox will not connect and will show you an error page. Learn more.
A Refresh can fix many issues by restoring Firefox to its default state while saving essential information like bookmarks and passwords.
Firefox automatically updates itself by default but you can always do a manual update. Learn how to update Firefox on Windows, Mac or Linux.