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When troubleshooting Firefox problems, resetting user preferences can be helpful in pinpointing the issue. This article explains how to do it.

{for =fx13} Resetting preferences (zoom, tabs, privacy, network, encryption, download actions, etc.) is one of many procedures that can be helpful in fixing Firefox issues. This has been simplified in the latest version of Firefox. Now you can restore Firefox to its factory default state while saving your essential information. [[Template:resetnote]] [[Template:resetsteps]] {/for} {for fx15} When [[Basic Troubleshooting|troubleshooting Firefox problems]], resetting preferences (zoom, tabs, privacy, network, encryption, download actions, etc.) is one of many procedures that can be helpful in pinpointing the issue. This article explains how to reset preferences by either removing the preferences files. {warning}'''Warning:''' If changes to preference settings are not saved when you restart Firefox, see [[Preferences are not saved]].{/warning} ==How to reset preferences to default== {note}'''Note:''' This will not affect any data stored in other files, such as toolbar data stored in the "localstore.rdf" file or any file-opening associations stored in the "mimeTypes.rdf" file.{/note} # Exit Firefox completely (if open). # Open the Firefox [[Profiles - Where Firefox stores your bookmarks, passwords and other user data|profile folder]]. #Delete (or rename) the prefs.js file. {warning}'''Warning:''' If you find more than one prefs.js file or a "prefs.js.moztmp" file, delete these files as well and read [[Preferences are not saved]].{/warning} # Delete the user.js file, if found, or move it to a backup location (this file does not exist by default). [[Template:ShareArticle|link=http://mzl.la/MLVHSq]]