Mozilla Bug 961365

$$ $\genfrac{}{}{0ex}{}{}{}$ $\genfrac{}{}{0ex}{}{}{}$ $\genfrac{}{}{0ex}{}{}{}$

$$ $\genfrac{}{}{0ex}{}{}{}$ $\genfrac{}{}{0ex}{}{}{}$ $\genfrac{}{}{0ex}{}{}{}$