https://en.wikipedia.org/wiki/Konami_code?veaction=edit , in Firefox.
Locate the sequence of references [5][6][7][8].
Delete one of them (not the first one), hit Space, a pawn appears.
Easter egg *in* Konami Code!
Version: unspecified
Severity: normal
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=54712