This started a few days ago after both Win and FF updates. Part way through a YT video, it freezes with the spinning wheel. Reload the webpage, the video resumes but without any audio. Clear history and cache, close and restart FF, still no audio for that webpage. Sometimes other YT webpages will play the audio for a while, then suffer the same spinning wheel / no audio after reloading. Copy & Paste the YT video URL into MS Edge and the YT video plays with no problems. ?????