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I now have installed Firefox to replace Internet explorer 9. Do I still need an other antivirus program like Mc Afee or Norton for protection of my laptop?

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At this moment I have Mc Afee installed but this will expire within a few weeks. Do I have to extend this if I use firewall instead of internet explorer?

At this moment I have Mc Afee installed but this will expire within a few weeks. Do I have to extend this if I use firewall instead of internet explorer?

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Yes you do.