There is something hacking and opening up site to download a virus/malware program which I never download. This only happens when I am using firefox - no other browser. I have tried uninstalling firefox and reinstalling twice. it still happens. I have macafee and Malware software active. Sometimes one or both block it but not always and it still keeps happening. It doesn't let me take screen shot when it opens I want to keep using firefox but if I can't stop this I will have to stop using it.