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Vivaldi will play CNN video, but Firefox won't, why?

Vivaldi will play CNN video, but Firefox won't, why?

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Do you get an error message that might provide more clues?

The two most common issues for video would be:

(1) Is the ffmpeg package installed? Firefox uses ffmpeg (external library) to decode MPEG-encoded media.

(2) Is DRM enabled and Widevine installed? This is needed for copy-protected media. See: Watch DRM content on Firefox.