Same issue here. Garbled noises are being heard on top of my music
(playing in the background via Rhythmbox) after starting Firefox and
visiting some random website.

My desktop is an AMD Ryzen on a Gigabyte X570 mobo with an nVidia
GeForce GTX 1060 3GB GPU. Like others noted, the noises seem stop for a
while when I change the Output Device from "Line Out - Starship/Matisse"
to "HDMI / DisplayPort X - GP106 High Definition Audio Controller". But
after some minutes playback (or perhaps visiting some other page with
firefox?), the garbled noises appear again... Also, like others, the
noises disappear if I close Firefox...

uname -a
Linux ryzen 5.8.0-59-generic #66~20.04.1-Ubuntu SMP Thu Jun 17 11:14:10 UTC 
2021 x86_64 x86_64 x86_64 GNU/Linux

sudo dmidecode -t 2
# dmidecode 3.2
Getting SMBIOS data from sysfs.
SMBIOS 3.3.0 present.
# SMBIOS implementations newer than version 3.2.0 are not
# fully supported by this version of dmidecode.

Handle 0x0002, DMI type 2, 15 bytes
Base Board Information
        Manufacturer: Gigabyte Technology Co., Ltd.
        Product Name: X570 GAMING X
        Version: Default string
        Serial Number: Default string
        Asset Tag: Default string
        Features:
                Board is a hosting board
                Board is replaceable
        Location In Chassis: Default string
        Chassis Handle: 0x0003
        Type: Motherboard
        Contained Object Handles: 0


sudo lshw -C sound
[sudo] password for dimitris: 
  *-multimedia              
       description: Audio device
       product: GP106 High Definition Audio Controller
       vendor: NVIDIA Corporation
       physical id: 0.1
       bus info: pci@0000:08:00.1
       version: a1
       width: 32 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list
       configuration: driver=snd_hda_intel latency=0
       resources: irq:127 memory:fc080000-fc083fff
  *-usb:0
       description: Video
       product: Webcam C270
       vendor: Logitech, Inc.
       physical id: 3
       bus info: usb@5:3
       version: 0.12
       serial: 212F66E0
       capabilities: usb-2.00
       configuration: driver=snd-usb-audio maxpower=500mA speed=480Mbit/s
  *-multimedia
       description: Audio device
       product: Starship/Matisse HD Audio Controller
       vendor: Advanced Micro Devices, Inc. [AMD]
       physical id: 0.4
       bus info: pci@0000:0a:00.4
       version: 00
       width: 32 bits
       clock: 33MHz
       capabilities: pm pciexpress msi bus_master cap_list
       configuration: driver=snd_hda_intel latency=0
       resources: irq:129 memory:fc900000-fc907fff

lspci | grep Audio
08:00.1 Audio device: NVIDIA Corporation GP106 High Definition Audio Controller 
(rev a1)
0a:00.4 Audio device: Advanced Micro Devices, Inc. [AMD] Starship/Matisse HD 
Audio Controller


dpkg -l | grep firefox
ii  firefox                                    89.0.1+build1-0ubuntu0.20.04.1   
      amd64        Safe and easy web browser from Mozilla

-- 
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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