Firefox Grid Drag'n'Drop issues

<zk>

Grid with details (dragging the column's cell label fails hovering the drop area)
	<grid xmlns:w="client" width="400px">
		<rows>
			<row draggable="true">
				<cell>Item 1</cell>
				<cell>INfo</cell>
				<detail>
					some more info
				</detail>
			</row>
		</rows>
	</grid>
Grid with no details (dragging the second column's cell label fails hovering the drop area)
	<grid xmlns:w="client" width="400px">
		<rows>
			<row draggable="true">
				<cell>Item 1</cell>
				<cell>INfo</cell>
			</row>
			<row draggable="true">
				<cell>Item 2 </cell>
				<cell>INfo</cell>
			</row>
		</rows>
	</grid>
	
	<div droppable="true" style="background-color: green" width="100px" height="100px">
		DROP HERE
	</div>
	
</zk>