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Every time I restart Firefox, pop up setting is turned off.

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Every time I start Firefox, the setting for pop ups is turned off. I do not have McAfee privacy. I use norton and have scanned for malware.

Every time I start Firefox, the setting for pop ups is turned off. I do not have McAfee privacy. I use norton and have scanned for malware.

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See http://kb.mozillazine.org/Preferences_not_saved

If you do not have user.js then try to rename or delete prefs.js in the Firefox Profile Folder