A new tab containing your troubleshooting information should open. See the Refresh Firefox - reset add-ons and settings article for more information. Note: When you use this feature, you will lose any extensions, toolbar customizations, and some preferences.
The Refresh feature (called 'Reset' in older Firefox versions) can fix many issues by restoring Firefox to its factory default state while saving your bookmarks, history, passwords, cookies, and other essential information.
