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A Refresh can fix many issues by restoring Firefox to its default state while saving essential information like bookmarks and passwords.
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.
Firefox automatically updates itself by default but you can always do a manual update. Learn how to update Firefox on Windows, Mac or Linux.
The Options/Preferences panels give you access to Firefox settings. This article describes what types of settings are available in each panel.