You could try uBlock Origin extension I have not seen a McAfee popup in a while

''<p>Wynne Jackson [[#question-1490233|said]]</p>'' <blockquote>Hi! I am currently receiving "Fake" pop-ups on my laptop from "McAfee".... but I know they're FAKE notices as I am not subscribed with McAfee. How can I block these pop-ups? Thank you! </blockquote> Are these small popups only on the far right corner of Firefox windows? if so then this may just be web push notifications sent from sites you have allowed to send you notifications from. You can revoke these sites. 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 Unfortunately some sites may send you junk, spam, fake virus alerts (including fake McAfee alerts) etc instead of useful information notifications.