Hello Mnrwest,

Alsa support was dropped starting Firefox 52.0 and later. Some Linux distros may have delayed this change with their own Firefox packages.

You could compile Firefox yourself with --disable-pulseaudio --enable-alsa

Keep in mind that if you do this you will not get updates from Mozilla as it will be a third-party build.

Bug 1247056 - Require PulseAudio to play sound on Linux

I hope resolve the problem

Thank you

But the audio in Firefox worked fine earlier today (with Firefox 77.0). And I have Firefox 77.0.1 on my system now.

Did you try to reboot the computer?

Any related messages in the Web Console ?

• "3-bar" menu button or Tools -> Web Developer
• https://developer.mozilla.org/en-US/Tools/Web_Console

Yes, I rebooted my computer (still no sound out of Firefox), but my other media players work fine (my operating system is VLocity64, if that is of any help.

Make sure you have the latest FFmpeg and libavcodec packages installed.

Hi mnrwest,

Its a bug.

It can be automatically fixed by following steps:-

1. Close firefox.
2. Open any other browser and play the youtube video.
3. Close that browser.
4. Open firefox and browse youtube.

PS: I hope you already have pulseaudio installed and the only problem exists due to firefox unable to start pulseaudio ( I believe ). This probably will be related to some permission issues which I don't know how to fix for the current time.

hello mnrwest,

please check the given instruction on your computer/laptop: Unmute Firefox and plugins

1. Open Firefox and play content that should play sound, such as this Firefox video or a Flash video with sound.
2. Click the volume icon in the Windows taskbar.
3. Click Mixer. The Volume Mixer window will appear.
4. Make sure the sliders for Mozilla Firefox and Plugin Container for Firefox (for plugin content such as Adobe Flash) are not muted or at the bottom.

Please click the link show helpfully image :

click me I am image

Check your audio device

Make sure that the audio device (such as speakers or headphones) are turned on and connected to the computer properly.

Other solutions

Check out whether other applications on your computer can play sounds. If they can't:

• Follow Microsoft's Fix sound problems tutorial.

If Firefox is the only application that you can't hear sound in:

• Try the solutions in Fix common audio and video issues.

i hope resolve the problem