Hello David! Thank you for your question. I am a licensed computer professional with over ten years of experience, and I will be assisting you today.I'm sorry about the issue. What is the website? Do you mean there is popup on that website only? Was that website working fine previously in Firefox?Can you test if this issue occur in Internet Explorer (the big 'e' program icon) also?Can we do a screen sharing session, so I can chat with you and help you directly?Edit: It looks like you are away; please reply back when you are available to continue. Thank you.