Trying to play Widevine with no Windows Media Foundation (nor Silverlight fallback), see https://support.mozilla.org/kb/fix-video-audio-problems-firefox-windows
ພະຍາຍາມເປີດ Widevine ໂດຍບໍ່ນຳໃຊ້ Windows Media Foundation (nor Silverlight fallback), ໃຫ້ເບິງທີ່ https://support.mozilla.org/kb/fix-video-audio-problems-firefox-windows