Anchor positions in One Page Checkout

I have noticed that Firefox and IE display the OPC slightly differently.

In IE, the page remains in the same position, as the user navigates from address to delivery method and to payment information.

However, in Firefox, the page scrolls vertically, such that the section heading (address, delivery method or payment information) is always positioned at the top of the screen, as if anchors (eg <a name="xyz">) are in use, and the small blue box containing the order total amount cannot be seen, unless the user scrolls upwards.

Is this an intended behaviour? It seems odd that if anchors are used, they are being interpreted in different ways by the two browsers. I prefer the IE behaviour.