Firefox table border issue

This should have a bottom border	Top cell with solid bottom border
	Bottom Cell - This should not have a bottom border

Table source:

<table style="border-collapse: collapse;">
<tr>
	<td rowspan="2" style="border-bottom: 2px dashed black;">This *should* have a bottom border</td>
	<td style="border-bottom: 1px solid black;">Top cell with solid bottom border</td>
</tr>

<tr>
	<td>Bottom Cell - This should not have a bottom border</td>
</tr>
</table>