*corrected: After much investigation into this because I was finding it as an issue everywhere I have looked, I have determined that what I am seeing is not the fault of the designer of this particular theme. She has my apologies. I will be using this theme while I work on building one for myself. For others moving forward:
From what I can gather, FireFox did not allow you to edit the color of tab backgrounds and such initially. This is now doable, but only via manual coding best as I can tell. The theme creator still does not support changing the new tab screen (and I imagine, many others).
**original review: Dark banner, light theme.