The extras tab is a place for fun things on this wiki, such as Featured things and Userboxes. It also has links to the blogs and the forum.
It also has the rules which describe the guidlines for editing on the wiki, chat, comments and the posting blogs. Another link on this tab is the Admins page. This page describes what the admins on this wiki do, it also has links to their profiles and walls making it easy to contact them.