libravatar.org footer covers content in firefox

In Firefox, the page footer covers whatever part of the page it is over when the page loads. Scrolling on the page moves the footer as well as the page content.

The page footer has css of "position: absolute;" in FF, but has "position: relative;" in Chrome where it behaves as expected.

Of no real consequence: in FF the footer is just a box but in Chrome it is a fancy curve topped element.