Hey guys, I had a brief discussion with a developer from Mozilla today about the OUYA. He informed us that they plan to bring Firefox to the OUYA. Here is what he had to say:

We're investigating what we need to do to make Firefox usable on Ouya. It already works and we have some preliminary patches for gamepad support, but there's still quite a bit of work to be done to make it really usable. Part of this work will be making sure that WebGL and Canvas support performs well on the device, and making sure that the relevant APIs (such as Gamepad API) are also supported
This is good news in my opinion!