This code is not in the extension; it is so you can see the html more clearly that is added in groupFeed.js.
$("menu#me div.grid-row div.grid-col-4 a.no-underline:nth-child(4)").append("
<a href='http://www.codecademy.com/dashboard/groups' class='no-underline'>
<li class='panel__item'>
<h5>Groups Feed</h5>
</li>
</a>
");