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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.
A Refresh can fix many issues by restoring Firefox to its default state while saving essential information like bookmarks and passwords.
The Options/Preferences panels give you access to Firefox settings. This article describes what types of settings are available in each panel.
Firefox warns you when a login form is not secure and your information could be stolen.