Not a Firefox browser issue.

''<p>Donald Rittenhouse [[#question-1479881|said]]</p>'' <blockquote>i AM RECEIVING EMAILS ALL DAY LONG FROM SECUREDJOINTNETWORK TELLING MY SYSTEM IS INFECTED.. MY SECURITY PREVENTS THAT i WANT THESE NOTICES STOPPED, BUT DON'T KNOW HOW TO DO IT.</blockquote> If these are only emails then it sounds like Phishing emails containing links to Securedjointnetwork.co.in are used to infect users if they click on them. https://malwaretips.com/blogs/securedjointnetwork/ Btw typing in all Caps is the internet version of shouting in peoples faces when you talk to them ;)