Hopefully someone will pick this up? Since my Surface Pro updated to Windows 1909 everytime Firefox updates it causes problems with sound. This is whether I am watching video outside Firefox, watching You tube in Firefox or any video in Firefox. Symptoms. Watching video in external video player, not having opened Firefox since rebooting surface pro - no issues Open Firefox watch a couple of vids on YouTube and sound fails - try going back to watching videos outside Firefox, video still failed. Cure- reload Windows. New update for Firefox (yesterday) and problem re-appears again. This happened a couple of years ago and I solved it then by deleting Firefox from my Surface Pro. After about 6 months I decided to give it another chance and all was good until after the 1909 update and Firefox updated. Reloaded Windows 1909 (clean copy) and all ok again until yesterday when Firefox updated again. Guess I'm going to have to reload Windows again to cure the issue caused by Firefox, again.