Fixes #13453: add firefox table-border and tbody bug to wall of bugs

docs/browser-bugs.html

@@ -23,6 +23,12 @@ lead: "A list of the browser bugs that Bootstrap is currently grappling with."
         </tr>
       </thead>
       <tbody>
+        <tr>
+          <td>Firefox</td>
+          <td><code>.table-bordered</code> with an empty <code>&lt;tbody&gt;</code> elements show no borders at all</td>
+          <td><a href="https://bugzilla.mozilla.org/show_bug.cgi?id=1023761">Mozilla bug #1023761</a></td>
+          <td><a href="https://github.com/twbs/bootstrap/issues/13453">#13453</a></td>
+        </tr>
         <tr>
           <td>Firefox</td>
           <td>Unusual default form control styles on Android</td>