How do I reset Firefox to factory settings in Windows?

To reset Firefox to factory settings, please see the following:

• Reset Firefox preferences to troubleshoot and fix problems

Note: If your Firefox differs from the steps displayed please change the Operating System and Firefox version by clicking their names at the top of the instructions.

Note: If Firefox is reset, these items and settings will be retained:

• Bookmarks
• Browsing history
• Passwords
• Cookies
• Web form auto-fill information
• Personal dictionary

These items and settings will be removed:

• Open tabs, windows, tab groups, extensions and themes, website-specific preferences, search engines, download history, DOM storage, security settings, download actions, plugin settings, toolbar customizations, user styles and social features.

There is no additional information.