This is pretty shameful. These were all posted by wiki user Dandonkulous (Daniel Buechner; @dandonkulous), who was Metalab's contact in the article. These may just be comps rather than a full product, but regardless, they demonstrate that significant effort has gone into producing a nearly identical copy of the original Metalab design. That's disappointing; if these allegations are correct, I'm very disappointed in Daniel and those involved at Mozilla in creating this product.
Update: Mozilla has removed the screenshots. Here are three of them: