I not really sure what is going on but about 2 days ago I started having an issue where I have no sound within Firefox. I have tried using youtube, ign, other video sites etc. This affects my primary speakers which are set as my default audio device. When I use my headphones, I do have sound. When I use any other application whether it is steam and the advertisements built into it for game trailers etc, GoG and i'm running a game, running another third party app for games, I have sound on all devices with no issues. I have checked to see if my settings are mirrored for each device and cannot find any differences. When running youtube in Microsoft Edge and Firefox, my settings are the same but only Edge gets sound. I have tried doing all of this with and without addons installed for Firefox. I have also disabled VPN, tried PC restarts and a fresh install of Firefox.