-moz-window-shadow

The CSS -moz-window-shadow Mozilla extension property specifies whether a window will have a shadow. Currently it only works on Mac OS X. Firefox 3 added support for transparent windows on Mac OS X. However, for these windows shadows were turned off and there was no way of turning them on. In Firefox 3.5 the default was changed: all windows will now have a shadow. The  property was introduced to provide a way to turn off unwanted shadows.

Values

 * - The window will have a shadow with the default window shadow style.
 * - The window won't have a shadow.

CSS example:

.KUI-panel { -moz-window-shadow: none; }