I got a strange message from a YouTube video popup suggesting that I install an "HD converter". The message was not an advert served in the usual YouTube format. I was given the following reference as a possible description of the problem: http://labs.bromium.com/2014/02/21/the-wild-wild-web-youtube-ads-serving-malware/ . I do not have Java on my PC. At the time of the hit, I was using FireFox and NoScript. I am running Windows 7 (current), NIS 2014 and FireFox 27.0.1.