Committed fix to 4.0 trunk at revision 41198 and to 3.3 EE maintenance branch at revision 41197. This was caused by ICE-9908, when the scrollable tables' styling was changed from overflow:auto to overflow:scroll. Now, this was changed again to overflow-y:scroll and overflow-x:auto, since only the vertical scrollbar is required to always appear, in order to solve some of the alignment issues fixed in ICE-9908.

EE-3.3.0-maintenance barnch rev. 41200 testing:
The dataTable Scrolling demo looks good now in Firefox29, however the table config panel, if opened, has also a styling issue in Firefox29 and Chrome35; not an issue in IE10 (image attached).

The last issue is not really an issue on our end. It happens in FF when the container height is just too short to be able to display the vertical scrollbar, like the minimum value in the demo (50). Simply using 52 or more avoids the problem. This issue is beyond our control and is easily fixed at the app level. In general, in production scenarios, there's no need to have such a short height for a scrollable container. I couldn't reproduce this issue in Chrome, but I suppose it's the same situation.

The scrolling demo was modified to allow for a minimum height of 60, so to illustrate an appropriate minimum height for a scrollable table (or any other scrollable container).