"It's probably worth reading through https://github.com/w3c/resource-timing/issues/64 and the proposal I linked above. In short, it's not clear that implementing the Origin header the way Chrome supports it actually helps with CSRF and it makes it harder (impossible really) to distinguish CORS requests."
Seems Firefox will implement it anyway because it's still better than nothing.
Seems Firefox will implement it anyway because it's still better than nothing.