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You should upgrade or use an alternative browser. I have a like new M1 MacBook Pro that I just purchased off eBay. Beautiful machine. I am getting notifications that my operating system in infected with a Trojan Horse virus and that my operating system will be removed. Do Macs need antivirus protection and if so, what is the best one. I have heard good things about Clean My Mac. Any advice pointing me in the right direction is much appreciated.