repeated messages that there is a system alert virus
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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Are these small popups in bottom corner? if so then they may just be Web Push Notifications from websites you have allowed to send you notifications. Unfortunately some sites may send what are basically fake virus or antivirus alerts.
https://support.mozilla.org/en-US/kb/push-notifications-firefox https://support.mozilla.org/en-US/kb/push-notifications-firefox#w_how-do-i-revoke-web-push-permissions-for-a-specific-site