I've used i-antivirus and deleted infected files. And yet, everytime I use firefox, annoying popups emerge when I click on a website (say, BBC.com or Netflix.com), smaller than the main windown, usually asking me to download something, such as "flash player". I've investigated my flash version and I'm up to date. It's clearly malware, because it also asks me to download various other things. It is a recent phenomenon, within the past few months. I've set my browser preferences to block popups, and these popups still keep coming - in spite of preferences being set to block popups. I'm on the verge of switching to Safari or another web browser, even though I've loved Firefox. It's because I can't find any support on the internet that can resolve this popup issue once and for all. Please help, I do not want to have to stop using Firefox.