I know, necrobumping old threads is not cool, but I’m really interested why this footer behaviour is Xwiki’s default. IMO a footer has to be at the bottom of the browser window/page at all times, it has no business in the middle of the screen and above that.
So I played with it a little to see if I could come up with something quick and easy, and what I’ve found is that by adding this css to my stylesheet, then for my particular browser, it achieves the effect, kinda of.
73 is a “magic number” that works for my single particular case.
This may not work for all browsers or all environments. However, it might serve as a guide for how you can properly edit the CSS to achieve what you want.