What are the core differences between Protestants and Eastern Orthodox Christianity?

I read an answer here which explained the difference between the various branches of the Eastern Church. I was thinking as an extension, what is the difference between Eastern Christianity and Protestant Christianity, as both seem to reject the claims of supreme authority from the Catholic Church? https://christianity.stackexchange.com/questions/95/what-are-the-major-differences-between-eastern-and-western-orthodox-christianiti https://christianity.stackexchange.com/questions/40715/why-arent-the-oriental-and-eastern-orthodox-churches-in-communion-with-each-oth?noredirect=1&lq=1