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What to do if Firefox won't play any sounds | Firefox Help
https://support.mozilla.org/en-US/kb/what-to-do-if-firefox-wont-play-any-sounds#:~:text=What%20to%20do%20if%20Firefox%20won%27t%20play%20any,properly.%203%20Other%20solutions.%20...%20.%20See%20More.
What to do if Firefox won't play any sounds | Firefox Help
https://support.mozilla.org/en-US/kb/what-to-do-if-firefox-wont-play-any-sounds
Check your audio device Other solutions Check the Volume Mixer Open Firefox and play content that should play sound, such as this Firefox video . Click the volume icon in the Windows taskbar. Click Mixer . The Volume Mixer window will appear. Make sure the slider for Mozilla Firefox is not muted or at the bottom. Check your audio device
How To Fix No Sound In Firefox Browser? [SOLVED]
https://silicophilic.com/no-sound-in-firefox/
Firefox do not play sound in any HTML5 player. | Firefox ...
https://support.mozilla.org/en-US/questions/966369
You have to: Right-click on your sound/speakers icon in the system tray and select Playback Devices, go to Speakers properties (the one which is green-ticked, also disable the red ones, if any), then go to Enhancements and tick Disable all sound effects. And that's it, restart the browser and enjoy.
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