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YouTube prefers VP9, when available. You can try disabling VP9 in Firefox by setting the about:config pref "media.mediasource.webm.enabled" = false. Depending o
by cpeterso 8y ago
YouTube prefers VP9, when available. You can try disabling VP9 in Firefox by setting the about:config pref "media.mediasource.webm.enabled" = false. Depending on your GPU, Firefox may be able to decode H.264 using a hardware decoder.
This YouTube page will show which codecs are currently enabled in your browser: https://www.youtube.com/html5 https://www.youtube.com/html5