[Bug 1906741] [NEW] Firefox sometimes causes garbled audio

[Dave Evans]

Public bug reported:

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.

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug focal

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Title:
  Firefox sometimes causes garbled audio

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