User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:57.0) Gecko/20100101 Firefox/57.0 Build ID: 20171226083017 Steps to reproduce: I just updated Firefox. Actual results: After update to the latest Firefox 57.0.3, the Firefox doesn't play audio. I am running it on Windows 10, Microsoft Surface Pro (2017 version). I tried reinstall firefox, nothing. I tried to reinstall audio driver on Surface Pro, no help. I am running out of ideas what to do. The issue simply is that when I am playing video/audio file in Firefox, the audio just is not working. Even in the Volume Mixer settings in Window it shows Firefox does not output any audio (the volume bar is "deaf", at zero)

Bug 1426293?

(In reply to YF (Yang) from comment #1) > Bug 1426293? Yes, Windows 10 Insider builds, thats exactly my problem too.