How to reset Firefox to default settings. To reset Firefox settings :
1- open Help - Troubleshooting Information or simply type about:support in the address bar and hit Enter.
2- Click on Refresh Firefox, on the right top side .
All your Firefox settings will be restored to default, your extensions, open tabs, sync settings, tab groups, themes and toolbars will be deleted.
However, your Passwords, Browsing history, Bookmarks, Cookies and Plugins will not be removed. They will instead be moved to new profile.
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