The page http://www.valutakurser.dk/ has a real time
exchange rate applet. It is broken in Mustang. It
worked in 1.4.2_06-b03. I have not tried figuring out
exactly when it broke, but it doesn't work in 1.6.0-ea-b52.

The page is in Danish, so you need to know what you're
looking for. The applet is on the right side of the screen
under the heading "REALTIDSKURSER" (real-time exchange rates).

In 1.4.2 it correctly displays the exchange rates, in Mustang
it does not.

Also, the applet crashes firefox if I shift-reload the page.
I'll file a separate bug on that issue.