Preferences not saved: Difference between revisions

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(afrf "other solutions" including restoring prefs.js from backup and link to standard diagnostic)
(→‎Other solutions: added DownThemAll issue.)
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==Other solutions==
==Other solutions==
* If you have a current [[profile backup]] you can replace the [[prefs.js file]] with the backup copy, in case the current file is corrupt.
* If you have a current [[profile backup]] you can replace the [[prefs.js file]] with the backup copy, in case the current file is corrupt.
* Some  extensions change preference settings; for example,  [https://addons.mozilla.org/en-US/firefox/addon/201 DownThemAll v1.0]  changes '''network.http''' settings after using it to download a file [http://forums.mozillazine.org/viewtopic.php?t=642871] (see  [[Problematic extensions]]  for details).  Try disabling your installed extensions before making changes to your options or preference settings, to see if one of them may be causing the problem. 
* The [[Standard diagnostic]] provides a basic troubleshooting guide if the preceding suggestions do not fix the problem.
* The [[Standard diagnostic]] provides a basic troubleshooting guide if the preceding suggestions do not fix the problem.



Revision as of 23:20, 27 March 2008

This article deals with changes to options or preference settings not being saved after you restart your Mozilla application. If Firefox toolbar customizations are not being saved, see this article.

Read-only or locked preference file

The inability to save any preference changes can be caused by having a read-only or locked prefs.js file or "prefs.js.moztmp" file in the profile folder. You may receive an error similar to "Failed to save the preferences file. Any preference changes will be lost at the end of the session" [1]. You may also find multiple files named "prefs-<n>.js" (where <n> is a number) in the profile folder. Check the file properties of the prefs.js file (and "prefs.js.moztmp" file, if found) and make sure that the "read-only" attribute is not set. You can also delete any "prefs-<n>.js" file copies.

Note that other software such as Dell Network Assistant may be causing the problem by locking or "protecting" the preference file. If you have this program, try disabling or uninstalling it [2]. See Multiple profile files created for more information about locked or multiple files in the profile.

User.js file locks certain preferences

If you are able to change some preference settings but not others, look for a user.js file in your profile folder (Windows users, read this for help finding it). The user.js file does not exist by default; it is created by users and, in a few cases, by some software programs, so that certain settings get written back to the prefs.js file each time you restart your Mozilla application If you find a user.js file, either remove it from the profile folder or edit the file to remove any unwanted settings. See Resetting preferences for more information.

Other solutions

  • If you have a current profile backup you can replace the prefs.js file with the backup copy, in case the current file is corrupt.
  • Some extensions change preference settings; for example, DownThemAll v1.0 changes network.http settings after using it to download a file [3] (see Problematic extensions for details). Try disabling your installed extensions before making changes to your options or preference settings, to see if one of them may be causing the problem.
  • The Standard diagnostic provides a basic troubleshooting guide if the preceding suggestions do not fix the problem.

See also

Locking preferences