Using the latest version of Firefox, v3.6, the RadListBox buttons show up in a vertical stack rather than displaying horizontally. It wasn't doing this with older versions of the browser though.  Example:

To recreate it, go to here:
http://demos.telerik.com/aspnet-ajax/listbox/examples/functionality/buttons/defaultcs.aspx

Then set the button position to Bottom.

It presets the horizontal alignment to left, which is fine, and the button position is technically on bottom, but the buttons overlap the listbox itself.

Any fixes for it?

Hello Eric,

Thank you for pointing the issue to us. The fix is going be available together with the next internal build. More information on how to obtain the latest internal can be found here. I have updated your telerik points for the report.

All the best,
Genady Sergeev
the Telerik team