This happened again to me today.  I was in a MSTeams chat session
(standalone app, not the web version) and opened a webpage in Firefox
that garbled the sound of the meeting in progress.  I noticed that when
it happened that in the system audio mixer/volume control manager, there
was suddenly a lot of entries for "speech-dispatcher" that previously
weren't there.  And this was also reflected in the list from the `ps`
command:

188672  0.0  0.0 450364  8304 ?        Sl   11:50   0:00 
/usr/lib/speech-dispatcher-modules/sd_espeak-ng 
/etc/speech-dispatcher/modules/espeak-ng.conf
188678  0.0  0.0 360052  5660 ?        Sl   11:50   0:00 
/usr/lib/speech-dispatcher-modules/sd_dummy 
/etc/speech-dispatcher/modules/dummy.conf
188681  0.0  0.0 360084  5972 ?        Sl   11:50   0:00 
/usr/lib/speech-dispatcher-modules/sd_generic 
/etc/speech-dispatcher/modules/mary-generic.conf
188684  0.0  0.0 360096  5492 ?        Sl   11:50   0:00 
/usr/lib/speech-dispatcher-modules/sd_generic 
/etc/speech-dispatcher/modules/espeak-generic.conf
188687  0.0  0.0 159724  2236 ?        Ssl  11:50   0:00 
/usr/bin/speech-dispatcher --spawn --communication-method unix_socket 
--socket-path /run/user/1000/speech-dispatcher/speechd.sock


Without touching the webpage or Firefox, I used the command-line to kill the 
one that looked to be the main speech-dispatcher process, which was the 188687 
process ID in this case (which also closed the other speech-dispatcher 
processes).  And immediately, the audio cleared up and I was able to continue 
browsing the webpage while the MSTeams meeting continued.

This makes me wonder if the problem is actually Firefox or if it's
speech-dispatcher -- or perhaps it's the data that Firefox is streaming
to speech-dispatcher??

Like the others in this thread, I have experimented with the speech
settings in Firefox to no avail.  If there's a magic setting to disable
it, I haven't found it.

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to firefox in Ubuntu.
https://bugs.launchpad.net/bugs/1906741

Title:
  Firefox sometimes causes garbled audio

Status in firefox package in Ubuntu:
  Confirmed
Status in pulseaudio package in Ubuntu:
  Confirmed

Bug description:
  Opening certain applications/websites at the same time as Firefox
  causes the audio to become garbled.

  The audio sounds distorted with an echo.

  Certain actions are guaranteed to cause this, but it can also
  happening when only running instances of Firefox.

  I've been able to consistently cause this by launching Zoom from a link 
within Firefox. 
  This does not occur when using Chrome. 

  The only way to fix the issue is to shut down all audio-related
  programs.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: firefox 83.0+build2-0ubuntu0.20.04.1
  ProcVersionSignature: Ubuntu 5.4.0-56.62-generic 5.4.73
  Uname: Linux 5.4.0-56-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  AddonCompatCheckDisabled: False
  ApportVersion: 2.20.11-0ubuntu27.12
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC2:  rdevans   55475 F.... pulseaudio
   /dev/snd/controlC0:  rdevans   55475 F.... pulseaudio
   /dev/snd/controlC3:  rdevans   55475 F.... pulseaudio
   /dev/snd/controlC1:  rdevans   55475 F.... pulseaudio
  BuildID: 20201112153044
  CasperMD5CheckResult: skip
  Channel: Unavailable
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Dec  3 16:55:36 2020
  Extensions: extensions.sqlite corrupt or missing
  ForcedLayersAccel: False
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  IncompatibleExtensions: Unavailable (corrupt or non-existant 
compatibility.ini or extensions.sqlite)
  InstallationDate: Installed on 2017-10-20 (1140 days ago)
  InstallationMedia: Ubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
  IpRoute:
   default via 10.0.0.1 dev enp7s0 proto dhcp metric 100 
   10.0.0.0/24 dev enp7s0 proto kernel scope link src 10.0.0.7 metric 100 
   169.254.0.0/16 dev enp7s0 scope link metric 1000
  Locales: extensions.sqlite corrupt or missing
  PrefErrors: Unexpected character ',' before close parenthesis @ 
/usr/lib/firefox/omni.ja:greprefs.js:354
  PrefSources: prefs.js
  Profiles: Profile0 (Default) - LastVersion=83.0/20201112153044 (In use)
  RunningIncompatibleAddons: False
  SourcePackage: firefox
  Themes: extensions.sqlite corrupt or missing
  UpgradeStatus: Upgraded to focal on 2020-11-12 (21 days ago)
  dmi.bios.date: 02/18/2011
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P1.40
  dmi.board.name: H67M
  dmi.board.vendor: ASRock
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrP1.40:bd02/18/2011:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnH67M:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.family: To Be Filled By O.E.M.
  dmi.product.name: To Be Filled By O.E.M.
  dmi.product.sku: To Be Filled By O.E.M.
  dmi.product.version: To Be Filled By O.E.M.
  dmi.sys.vendor: To Be Filled By O.E.M.

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