There's an extension on Google Chrome that allows you to skip silences on YouTube videos. Unfortunately, this extension doesn't work on Firefox as noted by the developer of the extension: "'Skip Silence' uses JavaScript's video.playbackRate and MediaSourceElement simultaneously to achieve its effect. Unfortunately, Firefox currently has a bug that stops video.playbackRate from working when already using MediaSourceElement - making this extension useless." Perhaps, Mozilla can implement a built-in feature on Firefox that allows us to skip silences on YouTube videos. Thank you.