Firefox Vulnerability
I just got notice of a vulnerability in Firefox from Wordfence. I have no original information, but I have generallly found that the Wordfence people provie good information. I will post a comment here (an a note at the top of this post) when this vulnerability has been fixed.
The one way to avoid the problem until it is fixed (the Mozilla people are good too and will doubtless get it done quickly), is to avoid using Firefox until they have completed their work.