Well, all of them actually. I applied them after I turned parallax off. background-repeat: no-repeat; can be removed becuase the image is so large, in my case I need background-attachment: fixed; background-position: top; to achieve the affect, though the position attribute was just a preference of mines. So long as the attribute exist, any of the values will achieve the affect.
Turning the parallax effect off across the board in all sections and heros removed the error, adding parallax to all or any one of them added the console error back.
Tested in Safari for good measure, seems the its only firefox that has the console error.