Preferences
Verified with Mozilla Firefox v8.2 — updated on September 2, 2026
Supported on: Firefox 81 or later, Firefox 78.3 ESR or later
Path in the GPO console
Computer Configuration\Administrative Templates\Mozilla\Firefox User Configuration\Administrative Templates\Mozilla\Firefox Description
Note: In order to use this policy, you must clear all settings in the old Preferences (Deprecated) section. If this policy is enabled, you can use JSON to configure preferences. If this policy is disabled or not configured, preferences are not modified. For detailed information on creating the policy, see https://firefox-admin-docs.mozilla.org/reference/policies/preferences/.
Registry
HKLM
Software\Policies\Mozilla\Firefox HKCU
Software\Policies\Mozilla\Firefox Export Builder
BETAConfigure the state, scope and options, then generate .reg, PowerShell, Intune and SCCM outputs — or add the setting to a multi-setting collection.
These exports write the registry — this is not a managed GPO. ⓘ
Applying both scopes creates an ambiguous configuration (computer takes precedence over user). Only do this intentionally.
.reg file
Windows Registry Editor Version 5.00
; Exported from gporais.com
; Policy: Preferences
; State: Enabled
; Scope: Computer (HKLM)
; Supported on: Firefox 81 or later, Firefox 78.3 ESR or later
[HKEY_LOCAL_MACHINE\Software\Policies\Mozilla\Firefox]
"Preferences"=hex(7):00,00
; REG_MULTI_SZ: one string per input line; edit in regedit if you need richer formatting.More formats (PowerShell, Intune, SCCM)
PowerShell
# Exported from gporais.com
# Policy: Preferences
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Firefox 81 or later, Firefox 78.3 ESR or later
$path = 'HKLM:\Software\Policies\Mozilla\Firefox'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'Preferences' -Value @() -Type MultiString
# REG_MULTI_SZ: one string per input line; edit in regedit if you need richer formatting.Intune XML
No direct Policy CSP / OMA-URI mapping for this policy. Use the Intune Remediation tab, or ingest the ADMX in Intune.Intune Remediation
# === Detection script ===
# Exported from gporais.com
# Policy: Preferences
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Firefox 81 or later, Firefox 78.3 ESR or later
function Test-RegistryValue {
param(
[Parameter(Mandatory = $true)][string]$Path,
[Parameter(Mandatory = $true)][string]$Name,
[object]$Expected,
[ValidateSet('String', 'DWord', 'MultiString')][string]$Kind = 'String',
[switch]$Absent
)
try {
$item = Get-ItemProperty -LiteralPath $Path -Name $Name -ErrorAction Stop
} catch {
return $Absent.IsPresent
}
if ($Absent.IsPresent) { return $false }
$actual = $item.$Name
if ($Kind -eq 'DWord') { return ([int64]$actual) -eq ([int64]$Expected) }
if ($Kind -eq 'MultiString') {
$actualValues = @($actual)
$expectedValues = @($Expected)
if ($actualValues.Count -ne $expectedValues.Count) { return $false }
for ($i = 0; $i -lt $expectedValues.Count; $i++) {
if ([string]$actualValues[$i] -ne [string]$expectedValues[$i]) { return $false }
}
return $true
}
return [string]$actual -eq [string]$Expected
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Mozilla\Firefox' -Name 'Preferences' -Expected @() -Kind MultiString)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Preferences
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Firefox 81 or later, Firefox 78.3 ESR or later
$path = 'HKLM:\Software\Policies\Mozilla\Firefox'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'Preferences' -Value @() -Type MultiString
# REG_MULTI_SZ: one string per input line; edit in regedit if you need richer formatting.SCCM scripts
# Exported from gporais.com
# Policy: Preferences
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Firefox 81 or later, Firefox 78.3 ESR or later
# SCCM Configuration Item guidance:
# Create a Configuration Item of type "Setting: Script".
# Discovery script: use the Detection script below.
# Remediation script: use the Remediation script below.
# Compliance rule: the Discovery script output equals 'Compliant'.
# === Detection script ===
# Exported from gporais.com
# Policy: Preferences
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Firefox 81 or later, Firefox 78.3 ESR or later
function Test-RegistryValue {
param(
[Parameter(Mandatory = $true)][string]$Path,
[Parameter(Mandatory = $true)][string]$Name,
[object]$Expected,
[ValidateSet('String', 'DWord', 'MultiString')][string]$Kind = 'String',
[switch]$Absent
)
try {
$item = Get-ItemProperty -LiteralPath $Path -Name $Name -ErrorAction Stop
} catch {
return $Absent.IsPresent
}
if ($Absent.IsPresent) { return $false }
$actual = $item.$Name
if ($Kind -eq 'DWord') { return ([int64]$actual) -eq ([int64]$Expected) }
if ($Kind -eq 'MultiString') {
$actualValues = @($actual)
$expectedValues = @($Expected)
if ($actualValues.Count -ne $expectedValues.Count) { return $false }
for ($i = 0; $i -lt $expectedValues.Count; $i++) {
if ([string]$actualValues[$i] -ne [string]$expectedValues[$i]) { return $false }
}
return $true
}
return [string]$actual -eq [string]$Expected
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Mozilla\Firefox' -Name 'Preferences' -Expected @() -Kind MultiString)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Preferences
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Firefox 81 or later, Firefox 78.3 ESR or later
$path = 'HKLM:\Software\Policies\Mozilla\Firefox'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'Preferences' -Value @() -Type MultiString
# REG_MULTI_SZ: one string per input line; edit in regedit if you need richer formatting.Building a multi-setting collection? Add this setting and generate combined .reg / PowerShell / GPO scripts.