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no prefs.jp file

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When I look in my program files (86), Mozilla Firefox, prefs.jp isn't there and my modifications do not stick. tried reinstalling, same issue.

When I look in my program files (86), Mozilla Firefox, prefs.jp isn't there and my modifications do not stick. tried reinstalling, same issue.

Chosen solution

Maybe you are asking about prefs.js

Also note you may well need to see hidden files and full file extensions, something Windows may not do by default. The file prefs.js is in the Firefox profile path not the programs path. There is an easy way of opening that from the troubleshooting page whilst Firefox is open as explained in Fred's post. See also

Your fastest and simplest solution will probably to do a Firefox Refresh BUT note that will remove Firefox add-ons so you may wish to bookmark the home sites of any addons you have. Also you seem to be way out of date and using Firefox 40 you should by now be on Fx48 with Fx49 due out next week

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Additional System Details

Installed Plug-ins

  • Shockwave Flash 22.0 r0
  • VLC media player Web Plugin

Application

  • User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:40.0) Gecko/20100101 Firefox/40.0

More Information

FredMcD
  • Top 10 Contributor
4258 solutions 59615 answers

Firefox comes in two or more folders on all computers. They are;

Maintenance: (Programs Folder) <Windows Only> Firefox itself: (Programs Folder) And one folder in the profile of each user on the computer.

If you remove the Firefox folder, the user folders would not be affected.


Only the Firefox programs are stored in the programs folder. User information is stored in the user's profile folder.

Type about:support in the address bar and press enter.

Under the page logo on the left side, you will see Application Basics. Under this find Profile Folder. To its right press the button Show Folder. This will open your file browser to the current Firefox profile. Now Close Firefox.

Firefox comes in two or more folders on all computers. They are; Maintenance: (Programs Folder) <Windows Only> Firefox itself: (Programs Folder) And one folder in the profile of each user on the computer. If you remove the Firefox folder, the user folders would not be affected. -------------------- Only the Firefox programs are stored in the programs folder. User information is stored in the user's profile folder. Type '''about:support''' in the address bar and press enter. Under the page logo on the left side, you will see '''Application Basics.''' Under this find '''Profile Folder.''' To its right press the button '''Show Folder.''' This will open your file browser to the current Firefox profile. Now '''Close Firefox.'''
John99 971 solutions 13138 answers

Chosen Solution

Maybe you are asking about prefs.js

Also note you may well need to see hidden files and full file extensions, something Windows may not do by default. The file prefs.js is in the Firefox profile path not the programs path. There is an easy way of opening that from the troubleshooting page whilst Firefox is open as explained in Fred's post. See also

Your fastest and simplest solution will probably to do a Firefox Refresh BUT note that will remove Firefox add-ons so you may wish to bookmark the home sites of any addons you have. Also you seem to be way out of date and using Firefox 40 you should by now be on Fx48 with Fx49 due out next week

Maybe you are asking about ''prefs.'''js''''' Also note you may well need to see hidden files and full file extensions, something Windows may not do by default. The file ''prefs.js'' is in the Firefox profile path not the programs path. There is an easy way of opening that from the troubleshooting page whilst Firefox is open as explained in Fred's post. See also * http://kb.mozillazine.org/Prefs.js_file ** http://kb.mozillazine.org/Finding_the_profile_folder_on_Windows#Viewing_hidden_files_and_folders * [[Use the Troubleshooting Information page to help fix Firefox issues]] * [[Profiles - Where Firefox stores your bookmarks, passwords and other user data]] * [[Reset Firefox preferences to troubleshoot and fix problems]] *''' [[Refresh Firefox - reset add-ons and settings]] ''' Your fastest and simplest solution will probably to do a Firefox Refresh BUT note that will remove Firefox add-ons so you may wish to bookmark the home sites of any addons you have. Also you seem to be way out of date and using Firefox 40 you should by now be on Fx48 with Fx49 due out next week * See [[Update Firefox to the latest version]]