Hi Mads Peter Jensen

This kind of “no sound only in Firefox” issue on Linux (especially Kubuntu) usually points to an audio routing or permission problem rather than the browser itself. Here are a few things to check:

Try the steps:

Check Firefox in the system volume mixer:

• Open Audio Volume (speaker icon) → Applications tab.

• Make sure Firefox isn’t muted or routed to the wrong output device.

• Sometimes it switches to “Monitor” or HDMI instead of speakers after a call.

Restart the PulseAudio / PipeWire sound service:

In a terminal, run:

• systemctl --user restart pipewire pipewire-pulse

• or (on older setups):

• pulseaudio -k && pulseaudio --start

Check site permissions:

• Go to any tab → click the padlock icon → Permissions.

• Ensure “Autoplay” is set to Allow Audio and Video.

Try Troubleshoot Mode:

• Menu ☰ → Help → Troubleshoot Mode… → Restart.

• See if sound works there (to rule out extensions or custom settings).

Test in a new Firefox profile:

• Go to about:profiles → Create a new profile → Launch profile in new browser.

• Test YouTube — if sound works, it’s likely a corrupted profile setting.

Reinstall or reset PulseAudio configuration (if nothing else works):

rm -r ~/.config/pulse && pulseaudio -k

Then restart Firefox.

If sound still doesn’t return, please share: Output of pactl info Whether you’re using PulseAudio or PipeWire And if Firefox shows up in pavucontrol under Playback We can dig deeper from there — but in most cases, restarting PipeWire/PulseAudio or re-selecting the correct audio device fixes it.

I have just updated Kubuntu (the weekly update) , and I noticed that there was a ffmpeg update included. This solved the problem and i now have sound from Firefox again. Just curious that is stoped working in the middle of a Jit.Si session?

Have a similar problem. At some point about two weeks ago, Firefox just quit playing audio with videos. First noticed it with YouTube, but happens with other videos as well. The same videos will play with audio using Librewolf (144.0.2-1). No problems playing videos with VLC.

I'm running Fedora Linux 42, KDE Plasma 6.5.1, Wayland. Firefox is 144.0.2. Since this started, I have installed updates a couple of times. Restarted Firefox and rebooted the system multiple times, natch. Tried troubleshoot mode. Checked the system volume mixer. Reset PulseAudio/Pipewire. There is no "Permissions" item under the padlock icon. Created a new profile. Nothing helped.

`pactl info`: Server String: /run/user/1000/pulse/native Library Protocol Version: 35 Server Protocol Version: 35 Is Local: yes Client Index: 190 Tile Size: 65472 User Name: twoprops Host Name: framis.sacdoc.org Server Name: PulseAudio (on PipeWire 1.4.9) Server Version: 15.0.0 Default Sample Specification: float32le 2ch 48000Hz Default Channel Map: front-left,front-right Default Sink: alsa_output.pci-0000_c1_00.6.analog-stereo Default Source: alsa_input.pci-0000_c1_00.6.analog-stereo Cookie: 9785:8a6c

> Whether you’re using PulseAudio or PipeWire

How would I know?

>And if Firefox shows up in pavucontrol under Playback

It does not.

I'm hoping that you have some ideas. I'll also be updating to Fedora 43, but I have to install new storage first so it might be a while. I'll report back if the upgrade changes anything.