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What anti virus protection software is best compatible while running firefox?

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I get a message that not all of the software with Kasperksy is compatible with Firefox, and I am in the timeframe that I will be updating or adding a new anti virus software to my desktop xp system. Wondering what anti virus protection software is compatible totally with firefox? Thanks for your help with this.

I get a message that not all of the software with Kasperksy is compatible with Firefox, and I am in the timeframe that I will be updating or adding a new anti virus software to my desktop xp system. Wondering what anti virus protection software is compatible totally with firefox? Thanks for your help with this.

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Avira Personal Free - http://www.free-av.com/