Firefox, like most browsers now, regularly update and patch very quickly.
I don't believe too much about what Homeland Security says anymore, but I guess if it is on a subject like this, it is true.
On another note, they had a little time after 9/11, why did the name it DHS when we already have a DHS. Or DHHS?
I use Netscape. I am the only one so hackers don't really pay much attention to me.