I don't usually go on Super User, but I wanted to check something in its FAQ so I went directly to https://superuser.com/faq. I got the "First time here? Check out the FAQ!" banner at the top, which should probably be suppressed if the user happens to be on the FAQ page at the time. I'm assuming this happens on all the sites and not just SU so I'm filing it here
The "Welcome" banner itself has been removed, so marking this status-completed.