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I am getting a high performance security alert regarding firefox from Norton, what does this mean?

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CathyStrong
CathyStrong
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Every time my mother turns her computer on Firefox a Norton warning pops up saying "Warning, High performance security alter, from firefox".

Every time my mother turns her computer on Firefox a Norton warning pops up saying "Warning, High performance security alter, from firefox".

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the-edmeister
the-edmeister
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http://norton.lithium.com/norton/