Click on YouTube and look for video's and in Firefox the background behind ALL the videos is black. Do the same in Chrome and ALL are white.
I really don't like the black background, I want it to be white, it's easier on my eyes or something.
Below are screen shots so you will understand and not think I'm talking about a particular video. This is when you first go to YouTube to look for videos.
I've spent a couple of hours changing themes to no avail. If I go to Google it's like always, a white background. Only Firefox using YouTube makes this black background.