This is the key point. The things she is being called out on are things that actually relate to her trustworthiness in the position she has entered, and as a cloud service provider trust should be very important to Dropbox.
Although I agree Rice's actions were much more direct, extensive, and much worse than Eich's by any measure, I don't agree that equal rights are necessarily less relevant to the leadership of Mozilla than neocon government overreach shenanigans is relevant to data privacy at Dropbox.