Unable to delete table with a keyboard only when editor contains only table

[natanielcz]

Affected browsers: Mozilla Firefox

1. Steps to reproduce: Create a table without line before and after (or just insert html from below)

<table style="width: 100%;">
    <tbody>
        <tr>
            <td>
                <br>
            </td>
            <td>
                <br>
            </td>
            <td>
                <br>
            </td>
            <td>
                <br>
            </td>
        </tr>
        <tr>
            <td>
                <br>
            </td>
            <td>
                <br>
            </td>
            <td>
                <br>
            </td>
            <td>
                <br>
            </td>
        </tr>
        <tr>
            <td>
                <br>
            </td>
            <td>
                <br>
            </td>
            <td>
                <br>
            </td>
            <td>
                <br>
            </td>
        </tr>
    </tbody>
</table>

2. Select table with mouse or Ctrl+A
3. Press delete to remove the table

On gif below on the left side is Google Chrome and on the right Mozilla Firefox