Trying to play Widevine with no Windows Media Foundation. See https://support.mozilla.org/kb/fix-video-audio-problems-firefox-windows
Windows Media Foundation (বা Silverlight fallback) ছাড়া Widevine চালানোর চেষ্টা করা হচ্ছে, দেখুন https://support.mozilla.org/kb/fix-video-audio-problems-firefox-windows