I am using firefox in linux mint basically and today I noticed that when I click on a youtube link it opens my firefox and then the youtube website and the video loads but the video doesn't play and keeps buffering when I click on the play video button. And then if I click on other youtube video those doesn't work too. So I have to close firefox everytime and then when I manually visit the youtube website everything works. But if my browser is closed and then I click on the youtube video it loads the video but doesnt play it and keeps buffering.