Given that you are using Windows 10 and known issues after updating it, chances are someting is wrong with, or you need to (re)install the Windows Media Feature Pack for your version.įix common audio and video issues Fix video and audio problems on Firefox for Windows N editions Then visit both support articles below to find out if there is any issue with regard to such playback.
Instead, you should make sure HTML5 playback is enabled by visiting this page. Note that YouTube does no longer use the Flash player by default, so it’s quite possible Flash is just ignored there. I would suggest to test if Flash is installed and working properly by going here or here first (note that the first link requires Flash set to Always Activate for best results.) If you have any doubts, then uninstall Flash using the available uninstaller on this page (you could also run that after first uninstalling Flah from Windows if you like) and reinstall it from here.
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