Default autoplay level: registry value DefaultUserHKCU\Software\Policies\Mozilla\Firefox\Permissions\Autoplay

Policy ID
Autoplay_Default
Scope
Computer Configuration, User Configuration
Supported on
Firefox 76 or later, Firefox 68.8 ESR or later
Source
Mozilla Firefox Policy Templates (version 8.3)
Category
Mozilla › Firefox › Permissions › Autoplay

Registry

Default

REG_SZUserComputer
Enabled value
Depends on the option value
Element
-
Options
ItemStored value
Allow Audio and Videoallow-audio-video
Block Audioblock-audio
Block Audio and Videoblock-audio-video
Apply with .reg · CMD · PowerShell
UserPer-account setting
.reg
Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Software\Policies\Mozilla\Firefox\Permissions\Autoplay]

; Options (use only one)
; Allow Audio and Video
"Default"="allow-audio-video"
; Block Audio
"Default"="block-audio"
; Block Audio and Video
"Default"="block-audio-video"
CMD
:: Options (use only one)

:: Allow Audio and Video
reg add "HKCU\Software\Policies\Mozilla\Firefox\Permissions\Autoplay" /v "Default" /t REG_SZ /d "allow-audio-video" /f
:: Block Audio
reg add "HKCU\Software\Policies\Mozilla\Firefox\Permissions\Autoplay" /v "Default" /t REG_SZ /d "block-audio" /f
:: Block Audio and Video
reg add "HKCU\Software\Policies\Mozilla\Firefox\Permissions\Autoplay" /v "Default" /t REG_SZ /d "block-audio-video" /f
PowerShell
# Common: create the key
New-Item -Path 'HKCU:\Software\Policies\Mozilla\Firefox\Permissions\Autoplay' -Force | Out-Null

# Options (use only one)
# Allow Audio and Video
New-ItemProperty -Path 'HKCU:\Software\Policies\Mozilla\Firefox\Permissions\Autoplay' -Name 'Default' -PropertyType String -Value 'allow-audio-video' -Force | Out-Null
# Block Audio
New-ItemProperty -Path 'HKCU:\Software\Policies\Mozilla\Firefox\Permissions\Autoplay' -Name 'Default' -PropertyType String -Value 'block-audio' -Force | Out-Null
# Block Audio and Video
New-ItemProperty -Path 'HKCU:\Software\Policies\Mozilla\Firefox\Permissions\Autoplay' -Name 'Default' -PropertyType String -Value 'block-audio-video' -Force | Out-Null
ComputerMachine-wide setting
.reg
Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\Software\Policies\Mozilla\Firefox\Permissions\Autoplay]

; Options (use only one)
; Allow Audio and Video
"Default"="allow-audio-video"
; Block Audio
"Default"="block-audio"
; Block Audio and Video
"Default"="block-audio-video"
CMD
:: Options (use only one)

:: Allow Audio and Video
reg add "HKLM\Software\Policies\Mozilla\Firefox\Permissions\Autoplay" /v "Default" /t REG_SZ /d "allow-audio-video" /f
:: Block Audio
reg add "HKLM\Software\Policies\Mozilla\Firefox\Permissions\Autoplay" /v "Default" /t REG_SZ /d "block-audio" /f
:: Block Audio and Video
reg add "HKLM\Software\Policies\Mozilla\Firefox\Permissions\Autoplay" /v "Default" /t REG_SZ /d "block-audio-video" /f
PowerShell
# Common: create the key
New-Item -Path 'HKLM:\Software\Policies\Mozilla\Firefox\Permissions\Autoplay' -Force | Out-Null

# Options (use only one)
# Allow Audio and Video
New-ItemProperty -Path 'HKLM:\Software\Policies\Mozilla\Firefox\Permissions\Autoplay' -Name 'Default' -PropertyType String -Value 'allow-audio-video' -Force | Out-Null
# Block Audio
New-ItemProperty -Path 'HKLM:\Software\Policies\Mozilla\Firefox\Permissions\Autoplay' -Name 'Default' -PropertyType String -Value 'block-audio' -Force | Out-Null
# Block Audio and Video
New-ItemProperty -Path 'HKLM:\Software\Policies\Mozilla\Firefox\Permissions\Autoplay' -Name 'Default' -PropertyType String -Value 'block-audio-video' -Force | Out-Null