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This article tells you how to fix issues where Firefox can't save some or all of the settings that you try to change.

Sometimes, your Firefox {for win}options{/for}{for mac,linux}preferences{/for} may not be saved after you change them. For example, you may change a setting in the {for win}Options{/for}{for mac,linux}Preferences{/for} window only to have it set back to its previous value when you open the {for win}Options{/for}{for mac,linux}Preferences{/for} window again. This article may also apply if you find that after upgrading Firefox, a '''Firefox Updated''' tab opens to a page stating ''You’ve been updated to the latest version of Firefox'' every time you start Firefox. The possible causes and solutions vary depending on whether you are unable to save a few specific preferences or if no preferences save at all. Your problem might also be due to malware. See [[Is my Firefox problem a result of malware]] for more details. __TOC__ {for fx13} =Reset Firefox to fix the problem= The easiest way to solve this problem is to restore Firefox to its factory default state while saving your essential information. This fixes a wide range of issues. If you'd like to try a more precise fix, skip this section and try the solutions below. [[Template:resetnote]] [[Template:resetsteps]] {/for} {for not fx13} = Resetting preferences file = If you are uncomfortable performing any of the steps below, you may choose to simply reset all preferences, to see if that resolves the problem. See [[Resetting preferences]] for detailed instructions. This will restore all Firefox preferences to the default state, except for any settings stored in a {filepath user.js} file, if one exists. {/for} = Specific preferences are not saving = If a specific setting in Firefox keeps resetting or you are unable to change a single setting but other settings save correctly, you may have {for win}one of the following issues{/for}{for mac,linux}the following issue{/for}. == Third-party programs changing Firefox settings == {for win} Some programs force Firefox to use certain settings. Below is a list of programs known to do this and actions you can take to make them stop forcing Firefox settings: * Creative ZenCast changes Firefox's user agent, interfering with Java. **Uninstall the program. <!-- http://support.mozilla.com/tiki-view_forum_thread.php?comments_parentId=6533&&forumId=1 --> * McAfee Privacy Service turns Firefox's pop-up blocker off. **See [[Pop-up blocker]]. <!-- http://support.mozilla.com/tiki-view_forum_thread.php?comments_parentId=2490&topics_offset=3&topics_sort_mode=lastPost_desc&forumId=1 --> * Norton 360 includes a "Firefox Privacy Cleanup" feature that, if enabled, overrides your Firefox Privacy settings and prevents you from keeping your Browsing History, Cookies or other private data between sessions. **See [[Configuring Norton 360#w_firefox-privacy-cleanup|Firefox Privacy Cleanup]] for more information on how to disable it. {/for} Some third-party toolbars and add-ons change Firefox's home page and search settings. You can quickly reset these with the [https://addons.mozilla.org/firefox/addon/searchreset/ SearchReset add-on]. *See [[Uninstalling toolbars]] for more information. == User.js file overriding preferences == {for win}If you don't have any of the above programs installed, or if you followed the suggestions and single preferences still aren't being saved, you{/for} {for mac,linux}You{/for} may have to edit Firefox's configuration files yourself. Don't panic, it's pretty easy. Here's how to do it. # [[T:profileFolder]] # [[T:closeFirefox]] # Open the file {filepath user.js} with a text editor (like {for win}Notepad{/for}{for linux}Gedit or Kate{/for}{for mac}TextEdit{/for}). #*If there is no {filepath user.js} file, these steps won't help you. # Remove the lines for the {for win}options{/for}{for mac,linux}preferences{/for} you want to be able to change. You can delete all the lines if you want to be able to change everything. # Save the file and close the text editor. You should now be able to change your Firefox settings. ==Firefox program file locks or prevents changes to certain preferences== Your installation of Firefox may have been customized to add a program configuration file that locks certain preferences or prevents certain changes from being saved. Follow the '''Reinstall Firefox''' step in the [[Troubleshoot and diagnose Firefox problems]] article to remove the Firefox program from your computer and then reinstall a new copy of Firefox. (Reinstalling Firefox this way will not remove your [[Profiles|user data and settings]], since those are saved in a separate location from the program files.) ==Corrupt mimeTypes.rdf== If Firefox does not remember the action to do when you download a certain file type, mimeTypes.rdf might be corrupted. Close Firefox, rename mimeTypes.rdf and restart Firefox. = Unable to save any preferences or settings = If none of your settings will save, if you get the '''Firefox Updated''' tab every time you start Firefox, or if you have tried the steps above with no effect, the file which Firefox uses to save your preferences may be locked or corrupted. == Locked preferences file == Firefox may be unable to save your settings if the {filepath prefs.js} file (or the {filepath prefs.js.moztmp} file, if it exists) is write-protected or there are other prefs backup files. {for win} # [[T:profileFolder]] # [[T:closeFirefox]] # Locate the {filepath prefs.js} file (and, if present, the {filepath prefs.js.moztmp} file). # Right click on each file in turn and select {menu Properties} from the context menu. Check that under '''Attributes''', there is no check in the box next to '''Read Only''' for either file. #*If RealPlayer is open, that may be locking the {filepath prefs.js} file. Closing RealPlayer should unlock it. # Delete any {filepath prefs-''n''.js} files where ''n'' is a number (e.g. {filepath prefs-2.js}). # Delete {filepath Invalidprefs.js} if it exists. # Restart Firefox. You should now be able to save preferences. {/for} {for linux} # [[T:profileFolder]] # [[T:closeFirefox]] # Locate the {filepath prefs.js} file (and, if present, the {filepath prefs.js.moztmp} file). # For each file, make sure that your user has write permissions to the file. # Delete any {filepath prefs-''n''.js} files where ''n'' is a number (e.g. {filepath prefs-2.js}). # Delete {filepath Invalidprefs.js} if it exists. # Restart Firefox. You should now be able to save preferences. {/for} {for mac} # [[T:profileFolder]] # [[T:closeFirefox]] # Locate the {filepath prefs.js} file (and, if present, the {filepath prefs.js.moztmp} file). # For each file, hold down the {key Ctrl} key as you click on the file then select {menu Get Info}. # Make sure that the '''Locked''' option is unchecked. # Delete any {filepath prefs-''n''.js} files where ''n'' is a number (e.g. {filepath prefs-2.js}). # Delete {filepath Invalidprefs.js} if it exists. # Restart Firefox. You should now be able to save preferences. {/for} == Corrupt preferences file == The preferences file may be corrupt, preventing Firefox from writing to it. If you delete this file, Firefox will automatically create another one when it needs to. Here's how to delete the {filepath prefs.js} file. {warning}'''''This will remove all your custom settings and settings for many extensions.'''''{/warning} # [[T:profileFolder]] # [[T:closeFirefox]] # Locate the {filepath prefs.js} file (and, if present, the {filepath prefs.js.moztmp} file). # Delete those files and any {filepath prefs-''n''.js} files where ''n'' is a number (e.g. {filepath prefs-2.js}). # Delete {filepath Invalidprefs.js} if it exists. # Restart Firefox. You should now have all your preferences reset. <!-- MZ credit --> <br/> <br/> '''''Based on information from [http://kb.mozillazine.org/Preferences_not_saved Preferences not saved (mozillaZine KB)]''''' [[Template:ShareArticle|link=http://mzl.la/Mt91fd]]