This always occurs solely on the same website (Breitbart dot com). A Script error dialog box offers me three options: stop the script, debug it, or cancel. Underneath this in the dialog box is "pixel.adsafeproteced.com" and a few other letters and numbers I can't remember. This always causes FIrefox to crash and no crash report is generated. I ran MS Essentials and it found and removed a Trojan on my system but doing this and then rebooting still hasn't solved the issue. This is the only site I seem to have an issue with and it uses the Disqus commenting system. Normally, when Breitbart opens there are popup ads that come out from the sides and since I've been having this problem the ads don't appear anymore but within moments of launch the script error appears and everything comes to a halt, forcing me to x-out of the dialog and then x-out of FireFox and my web session altogether. I wish I had saved a screen shot to add to this inquiry. I suppose I could simply stop using the site but I think that was the intention of the attack.