unwanted site keeps sending me malicious pop-ups

Sounds like your computer or browser is malware infected and needs a computer shop to address your issue as that isn't a Firefox browser user help to fix this.

''<p>sam.rosenberg [[#question-1492786|said]]</p>'' <blockquote>this site: keeps sending me malicious and unsolicited pop-ups How do I stop it </blockquote> Are these small popups on the bottom right corner of Firefox windows?. If so then these could just be Web Push Notifications from sites you have allowed to send you notifications from. Unfortunately some sites may just send you junk, spam, fake virus alerts etc instead of useful information. You can revoke these sites from sending you notifications. 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