This issue hasn't happened until ever since the newest windows 10 insiders preview Build 17063,rs)prerekease,171213-1610 was release and update to my computer first i thought it was a driver issue so I did a full reinstall of windows 10 and this time I installed firefox again and it finally worked for audio with no issues but after I did the update again no websites can play audio. In the sounds manager it says that firefox isn't even playing audio at all and even though I have no muted windows in firefox or in youtube it still has not audio. But audio does work in the Microsoft edge.