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Firefox won't play Audio from Realtec speakers
YouTube refuses to play audio out of one audio output, which is specifically Speakers (Realtek(R) Audio) Audio works fine testing other browsers, and other apps.
Tried disabling hardware acceleration, but the issue persists. Firefox up to date. Graphics driver up to date. Windows 10
Edition Windows 10 Home Version 21H2 Installed on 8/12/2021 OS build 19044.1706 Experience Windows Feature Experience Pack 120.2212.4170.0
Have you looked here:
What to do if Firefox won't play any sounds https://support.mozilla.org/en-US/kb/what-to-do-if-firefox-wont-play-any-soundsRead this answer in context 👍 1