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 Are these small popups on bottom right corner, if so then they may just be Web Push Notifications from sites you have allowed to send you notifications. Unfortunately some notifications from some sites can be fake virus alerts and other such junk instead of useful notification messages from sites. You can revoke these sites from sending you notifications.

Thank you. This may solve the problem They do pop up on the right bottom and have 123greeting.com at the end of the ad. I've gone on 123 and tried to delete them sending me anything.