When I'm watching a youtube video, if I drag the red time slider to the right to advance the video the loading wheel starts spinning and the play button becomes unresponsive. It would stay like that forever if I left it, yet if drag the slider in small amounts back and forward it starts to play again. What is stopping it from resuming itself when it freezes like that? The video can't have stopped loading as I can often drag the slider forward a minute or two and it will resume, and if I drag to more or less the original place I dragged it to it will hang again. It's really annoying. Using Firefox 65.0.2 64bit although it's also done this on earlier versions.