In Firefox this website shows a marquee in both the address bar and the browser tab:
ClimaGuard SPF (http://www.climaguardspf.com)

Do you see the same thing I'm seeing?

It's not seen in IE.

What causes that little marquee bit?

Yeah, seems the favicon is animated.
Never seen that before.

It would be cool if you could get it to be as wide as the browser tab.