The accountability is at the top. In this case, I would be very surprised if that was not greenlighted by Mozilla's CMO. Whether others down the chain complained or not doesn't matter much, since not everyone can vote with their feet.
But this is happening way to often lately, and the typical "I stay at Moz because we are still doing good stuff and no one else would step in" you hear from employees is exactly the card that the management plays. It's sad, because the mission from Mozilla's manifesto is more important than ever, but MoCo is not the place where this important things will happen.
Something has gone very wrong with the culture of mozilla in general, I think its a copout to suggest that its merely some evil pointy haired boss.