Extension:FilterListUsers

FilterListUsers is a MediaWiki extension that hides users who have made 5 or less edits from Special:ListUsers unless the current user has the  user right, in which case they can view the full, "uncensored" user list. Users who belong to one (or more) of the following groups are also not filtered out: sysop, bureaucrat, steward, staff, globalbot

By default administrators have the  user right, so they can view the full user list.

This extension is based on an old core hack by Wikia.