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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 not fx13} When [[Troubleshoot and diagnose Firefox problems|troubleshooting Firefox problems]], resetting preferences (zoom, tabs, privacy, network, encryption, updates, where to save file downloads, etc.) is one of many procedures that can be helpful in pinpointing the issue. This article explains how to use [[Troubleshoot Firefox issues using Safe Mode|Safe Mode]] to reset preferences. *If changes to preference settings are not saved when you restart Firefox, see [[Preferences are not saved]]. To reset preferences: [[T:safemode]] # Click to put a check mark by '''Reset all user preferences to Firefox defaults'''. {for win}<br/> <br/> [[Image:89a0533be70261469542ad18a5b0fa00-1259976432-945-1.png]] <br/> {/for}{for mac}<br/> <br/> [[Image:89a0533be70261469542ad18a5b0fa00-1256947708-467-1.png]] <br/>{/for} # To apply your changes, click {button Make Changes and Restart}. Firefox will restart with your preference settings changed back to the defaults. {/for} {for fx13} Resetting preferences (zoom, tabs, privacy, network, encryption, updates, where to save file downloads, etc.) is one of many procedures that can be helpful in [[Troubleshoot and diagnose Firefox problems|troubleshooting Firefox problems]]. We'll explain two ways to do this - reset Firefox to its default state and delete the preference files. *If changes to preference settings are not saved when you restart Firefox, see [[Preferences are not saved]]. __TOC__ =Solution 1: Reset Firefox to its default state= [[Template:resetnote]] [[Template:resetsteps]] =Solution 2: Delete Firefox preference files= {/for} {for =fx13,=fx14} [[T:safemode]] # Click to put a check mark by '''Reset all user preferences to Firefox defaults'''. {for win}<br/> <br/> [[Image:89a0533be70261469542ad18a5b0fa00-1259976432-945-1.png]] <br/> {/for}{for mac}<br/> <br/> [[Image:89a0533be70261469542ad18a5b0fa00-1256947708-467-1.png]] <br/>{/for} # To apply your changes, click {button Make Changes and Restart}. Firefox will restart with your preference settings changed back to the defaults. {/for} {for fx15} #[[Template:OpenProfileFolder]] #[[Template:closeFirefox]] #Locate and delete the file {filepath prefs.js} (or rename it, for example, to ''prefs.jsOLD'', to keep the old file as a backup). If you find more than one, a {filepath prefs.js.moztmp} file or a {filepath user.js} file, delete (or rename) these as well. #You can close the profile folder and open Firefox now. {/for}