killing unneeded tooltip

apps/base/templates/_header.html

@@ -28,7 +28,6 @@
 			{% else %}
 				<li {% if page == "signin" %}class="active"{% endif %}>
                 <span><a id="signin" title="Sign In" href="{{ login_url }}">Sign In</a></span>
-					<div class="UI_tooltip_source" data-tooltip-for="signin" data-tooltip-title="Sign In">Sign in with your addons.mozilla.org account.</div>
 				</li>
 			{% endif %}
 		</ul>