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Just what it says in the title, really.
Is McAffee Security Scan essential for installing or using the Flash Player addon for Firefox?
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If you don't want McAffee Security Scan, uncheck it.
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Adobe earns commission from companies like McAfee, Google etc., if the user chooses to download any of them with a free Adobe product. But they can cause compatibility issues with other anti-virus scanners which you may already have installed, so it's better to avoid them by removing the checkmark.