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Closed captioning text color & font size

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How can I change the font color and size of closed captions? I am using Firefox Version 115.4 (64 bit) on a Windows 7 Pro computer.

How can I change the font color and size of closed captions? I am using Firefox Version 115.4 (64 bit) on a Windows 7 Pro computer.

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This would require a site-specific solution unless you are referring to subtitles in the Picture-in-Picture feature.