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Your latest upgrade states that it is incompatible with my Avast Virus protection and others who have McAfee have the same problem. Does this mean if we update Firefox it will interfere with our virus software?

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Your new recommended update appears incompatible with my and other's virus protection. How can we be sure we can safely navigate if your security on the older versions of firefox are lifted? It seems that many people are having this problem and have said they will return to Internet Explorer. Please advise as I prefer Firefox but cannot take the chance of malware and other infections. I would appreciate a hasty response.

Your new recommended update appears incompatible with my and other's virus protection. How can we be sure we can safely navigate if your security on the older versions of firefox are lifted? It seems that many people are having this problem and have said they will return to Internet Explorer. Please advise as I prefer Firefox but cannot take the chance of malware and other infections. I would appreciate a hasty response.

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No, it doesn't affect your anti-virus program, only the silly little extensions that some anti-virus applications install into Firefox that duplicate features which are built into Firefox = anti-phishing & web forgery protection.