No matter what firefox does well, it isn't going to keep converts as long as their default background is so blindingly white. I still don't understand why fire

No matter what firefox does well, it isn't going to keep converts as long as their default background is so blindingly white. I still don't understand why firefox refuses to slightly gray out their background by default. Chrome puts less strain on my eyes and that's far more important than anything firefox does well. Every time I try to stick with firefox, my eyes get strained and eventually I go back to chrome.