I recently installed a nice theme called Fractal-01 Song of a morning breeze. I had to installan add-on to change the menus that were white and thus invisible, but I have not figured out how to get the grey buttons for like Home and Back and Reload black, and they are very hard to see with this theme.

I tried changing them in Custom Theme Restorer, but nothing seems to change them to black. I can't imagine that the person who designed this theme would have made these washed out colors that blend into the theme the default, but maybe he or she did. It is a shame to give up on such a nice theme if I don't have to, but it helps if you can see your buttons.