When I downloaded firefox, it also downloaded McAffee Security Scan Plus. Why? Is this going to interfere with my other anti-virus?

downloaded firefox and also downloaded McAffee Security Scan Plus.
Why? Will it interfere with my other anti-virus

Where did you download Firefox from? It does not come with McAfee Security Scan if you download it from http://www.mozilla.com/ - it has no extra applications included.
Are you sure it was not a plugin that included the McAfee Security Scan, for example the Adobe Flash plugin will by default include it.

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