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customization does not keep preferences

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I set up my preferences in customize page (thinks like search bar, home page and bookmark) exit and every time i close firefox and reopen it it isn't there. All of the buttons and search bar is gone.

I set up my preferences in customize page (thinks like search bar, home page and bookmark) exit and every time i close firefox and reopen it it isn't there. All of the buttons and search bar is gone.

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There is software like Advanced SystemCare with its Surfing Protection feature that can protect files in the Firefox profile folder against changes. If you have such software then check the settings or uninstall this software.

You can check for problems with preferences.

Delete possible user.js and numbered prefs-##.js files and rename/remove the prefs.js file to reset all prefs to the default value including prefs set via user.js and prefs that are no longer supported in current Firefox releases.

You can use the button on the "Help -> Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page.