Bill,
I've just changed Firefox back to the default screen colours and I must say the board looks really good.
(I was on a black background with white text for about 3 years)
Like anyone else that has replied here, I have a problem with the preferences and changing them, I tried the Dark template and it looked pretty good, but I can't change over to it because of an error that keeps coming up.
Also Bill,
Has the ability to have a small avatar been turned off in the settings?.
I can't see anywhere where you can upload an avatar?.