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repeated messages that there is a system alert virus

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Getting repeated Firefox popups saying a virus has been detected attempts to connect me to McAfee security. My Windows Defender says there is no virus but the popups reappear when I've close them. I did a firefox refresh to no avail

Getting repeated Firefox popups saying a virus has been detected attempts to connect me to McAfee security. My Windows Defender says there is no virus but the popups reappear when I've close them. I did a firefox refresh to no avail

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