Probably the most annoying ad this site has ever had, and that includes the virus-laden ones. :)
If you let it load, it takes over the top half of the page and anywhere you click opens a new HR Block window. You can't click anywhere on the page and get anything except a new window thanks to this ad. You have to scroll down to avoid it.
I don't use ad-blocker plugins but this is tempting to me.
browser is firefox