Borders not shown in Firefox with border-collapse on table, position: relative on tbody, or background-color on cell

Consider the following HTML:

<html>
<head>
    <style>
        TABLE.data TD.priceCell
        {
            background-color: #EEE;
            text-align: center;
            color: #000;
        }
    
        div.datagrid table
        {
            border-collapse: collapse;
        }
    
        div.datagrid table tbody
        {
            position: relative;
        }
    </style>
</head>
<body>
    <div id="contents" class="datagrid">
        <table class="data" id="tableHeader">
            <thead>
                <tr class="fixed-row">
                    <th>Product</th>
                    <th class="HeaderBlueWeekDay">Price</th>
                    <th class="HeaderBlueWeekDay">Discount</th>
                </tr>
            </thead>
            <tbody>
                <tr style="font-style: italic;">
                    <td>Keyboard</td>
                    <td class="priceCell">20</td>
                    <td style="border-right: #3D84FF 1px solid; border-left: #3D84FF 1px solid;" class="priceCell">2</td>
                </tr>
            </tbody>
        </table>
    </div>
</body>
</html>

Notice that the last cell has a left and a right border in its inline style. You (or at least I) would expect this to be visible. In IE, this is the case. But in Firefox (6), this is not. You can solve this by:

Removing position relative on div.datagrid table tbody in the CSS
Changing div.datagrid table tbody to div.datagrid table in t

css firefox border

Edit Report

Borders not shown in Firefox with border-collapse on table, position: relative on tbody, or background-color on cell

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