Trying to play Widevine with no Windows Media Foundation (nor Silverlight fallback), see https://support.mozilla.org/kb/fix-video-audio-problems-firefox-windows
Windows Media Foundation (və Silverlight) olmadan Widevine oynatmağa çalışılır, https://support.mozilla.org/kb/fix-video-audio-problems-firefox-windows səhifəsinə baxın