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Pop ups warning about Firefox being infected.

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I keep getting pop ups warning me that Firefox is infected with viruses and I need to download and pay for a McAfee security program. How do I stop the pop ups? My computer's protection does not indicate a problem. Can Firefox be infected?

I keep getting pop ups warning me that Firefox is infected with viruses and I need to download and pay for a McAfee security program. How do I stop the pop ups? My computer's protection does not indicate a problem. Can Firefox be infected?

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Are these small popups on bottom corner? if so then these may actually just be Web Push Notifications from one or more websites you have allowed to send you notifications from. Unfortunately some of the notifications from some sites can be fake virus and fake random Antivirus client alerts. You can revoke permissions for the 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

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