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Firefox uses H.264 for YouTube on macOS, so it can use the system's H.264 hardware decoder, which should be faster and use less power than a software decoder. C
by cpeterso 8y ago
Firefox uses H.264 for YouTube on macOS, so it can use the system's H.264 hardware decoder, which should be faster and use less power than a software decoder. Chrome uses a VP9 software decoder on YouTube. You can try VP9 in Firefox by setting the about:config pref "media.mediasource.webm.enabled" = true, but it is disabled by default for good reasons. :)
This YouTube page will show which codecs are currently enabled in your browser: https://www.youtube.com/html5 https://www.youtube.com/html5