Board Thread:Support Requests - Getting Technical/@comment-4839035-20130218202430/@comment-3335785-20130219112304

It's not always blue (it varies based on theme designer settings) but I believe this would refer to the tabs admins can see at the top of pages like Special:RecentChanges.

Incidentally it could be done, but it's not completely un-useful. Something like display:none; } works, but there are side effects. Where I tested it the AjaxRC checkbox is mounted on the dashboard tabs, and vanished with the header. In short it can't be turned on or off without modifying the script somewhat (I don't know if this a standard thing or just the script used on the wiki I tested it on).
 * 1) AdminDashboardHeader {

It also spills over to the admin dashboard itself (although there are ways around this) hiding the advanced/general tabs. Whilst advanced is basically Special:AllPages with some not-very-useable viewing stats general has links to Wiki features, Promote, User rights, Top Navigation (MediaWiki:Wiki-navigation) and so on.

So yeah, it can be done, but I wouldn't advise it.