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I prefer the dark Deep Seas style, easier on the eyes. The same for youtube and every other site should have an option to switch to dark style. I tried some extensions, but they don't always work well.Note1: This thread is perhaps best viewed with a white background, (e.g., FreeOnes Classic style) - see bottom left for choice of page styles.
Note2: Repeatedly clicking the Refresh button or toggling between FreeOnes Classic and Deep Seas styles, eventually expanded the working area, at least temporarily, from 760 to 1020 pixels wide.