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Why does my toolbar add ons keep disappearing?

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I keep adding add on buttons to my toolbar and then they will disappear and i have to add them again

I keep adding add on buttons to my toolbar and then they will disappear and i have to add them again

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You can check for problems with preferences.

Delete possible user.js and numbered prefs-##.js files and rename (or delete) 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 the current Firefox release.

You can use this button to go to the currently used Firefox profile folder: