Ok lets face this - there were no bugs before. I have KIS 2013 on my pc and MSE in my laptop. I run a complete checking program at least twice a week. It cleans out the junk, modifys broken shortcuts and many other things, but it also checks auto for malware.
There was nothing on my laptop on Wednesday when I switched it on and downloaded and installed FF19. I switched it off. On Thursday evening, at work, I plugged in, attached the rj45, FF19 as default and off I went - oops! what the hell is this, I never clicked on it. It was one of the 9 bugs in FF, followed by another window and another.
Removed FF19 as default to lunarscape and problem ceased. Then got a note off a tech mate - run this link it said - a link to Sophos. Clear report as I had removed the bugs with Iobit Malfighter. After that I deleted FF19 and installed IE10 for win 7 x 64, made that default, and all ok.
Whilst I do not doubt your reasoning and sincerity I cannot dispute what happened or what I found. It may be a coincidence but hackers at a conference in Canada where bragging about how they had hacked FF and other browsers, this was on the internet news.