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settings changed

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I accessed my ff browser today and all my browser settings were changed. I did not manual change any of my browser settings. Should I be concerned about a virus or is there something wrong with your software. Please advise me.

I accessed my ff browser today and all my browser settings were changed. I did not manual change any of my browser settings. Should I be concerned about a virus or is there something wrong with your software. Please advise me.

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You can check for problems with preferences and try to rename or delete the prefs.js file and possible numbered prefs-##.js files and a possible user.js file to reset all prefs to the default values.