Edit: This addon is long abandoned, was great, but does not update for months now. Sad.

This converter is working great on every sites, not abstrusive, loving it.

However, on dx.com it does not work properly, at the checkout page e.g. the total is like this:
Grand Total: $ 3 891.29 Ft
Here the original price is shown but with Ft currency mixed with the original $ currency.