If you insert this into the <head></head> section
<style>
table, td {border: solid 1px #f9c24f}
</style>
It should fix it firefox if you haven't already.
It will affect all the tables in that page though.
You can apply it to certain parts with a class name. Example:
<style>
.nameoftable {border: solid 1px #f9c24f; }
</style>
then in the table's code, you need to add
<table class="nameoftable">
<tr>
<td class="nameoftable">
</td>
</tr>
</table>