Chrome bundles certain codecs where Firefox relies on system packages, so it's possible to see differences due to this. Can check if following videos play (you may need to click the play button on the video at the top of the page)? 1. [First one](https://shaka-player-demo.appspot.com/demo/#audiolang=en-US;textlang=en-US;uilang=en-US;asset=https://storage.googleapis.com/shaka-demo-assets/sintel-mp4-only/dash.mpd;panel=ALL_CONTENT;panelData=MP4;build=uncompiled) 2. [Second one](https://shaka-player-demo.appspot.com/demo/#audiolang=en-US;textlang=en-US;uilang=en-US;asset=https://storage.googleapis.com/shaka-demo-assets/sintel-webm-only/dash.mpd;panel=ALL_CONTENT;panelData=WEBM;build=uncompiled)
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Chrome bundles certain codecs where Firefox relies on system packages, so it's possible to see differences due to this. Can check if following videos play (you may need to click the play button on the video at the top of the page)? 1. [First one](https://shaka-player-demo.appspot.com/demo/#audiolang=en-US;textlang=en-US;uilang=en-US;asset=https://storage.googleapis.com/shaka-demo-assets/sintel-mp4-only/dash.mpd;panel=ALL_CONTENT;panelData=MP4;build=uncompiled) 2. [Second one](https://shaka-player-demo.appspot.com/demo/#audiolang=en-US;textlang=en-US;uilang=en-US;asset=https://storage.googleapis.com/shaka-demo-assets/sintel-webm-only/dash.mpd;panel=ALL_CONTENT;panelData=WEBM;build=uncompiled) Edit: Could you also check the console (Tools -> Browser Tools -> Web Developer Tools -> Console) for any output when videos fail to play?