I can't force myself to think about the design as an item that comes in a opaque box with price tag. You have to try if design fits. If it fits you keep it, pay for it and everyone is happy. If not, you don't pay for it and toss it away what apparently Mozilla did. Same thing you do with photographs. You try many of them, but buy only the ones that go into final design. I wonder if MetaLab pays for all the photos that go through its designers hands.

There are some screenshot that prove that at some point that design was tried to be fitted. That's all. Not that Mozilla took design home and unboxed it without paying.