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Why can´t I use AVAST wiht firefox 6.0.1?

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It comes up in the update to 6.0.1 that AVAST antivirus doesn´t work in this version. Why?

It comes up in the update to 6.0.1 that AVAST antivirus doesn´t work in this version. Why?

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You misread that message. Firefox only disables Avast extensions that aren't compatible with Firefox 6.0, it doesn't disable the entire anti-virus or security application. See Avast support about the availability of an update for the Avast extensions for Firefox.