Allowed Sites
Verified with Mozilla Firefox v8.2 — updated on July 10, 2026
Supported on: Firefox 142 or later, Firefox 140.2 ESR or later
Path in the GPO console
Computer Configuration\Administrative Templates\Mozilla\Firefox\Permissions\Screen Sharing User Configuration\Administrative Templates\Mozilla\Firefox\Permissions\Screen Sharing Description
If this policy is enabled, screen sharing is always allowed for specified origins. If this policy is disabled or not configured, screen sharing requests follow the default policy.
Registry
HKLM
Software\Policies\Mozilla\Firefox\Permissions HKCU
Software\Policies\Mozilla\Firefox\Permissions 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: Allowed Sites
; State: Enabled
; Scope: Computer (HKLM)
; Supported on: Firefox 142 or later, Firefox 140.2 ESR or later
[HKEY_LOCAL_MACHINE\Software\Policies\Mozilla\Firefox\Permissions\ScreenShare\Allow]
; List values: enter one value per line in the builder UI.More formats (PowerShell, Intune, SCCM)
PowerShell
# Exported from gporais.com
# Policy: Allowed Sites
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Firefox 142 or later, Firefox 140.2 ESR or later
$path = 'HKLM:\Software\Policies\Mozilla\Firefox\Permissions\ScreenShare\Allow'
New-Item -Path $path -Force | Out-Null
# List values: enter one value per line in the builder UI.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: Allowed Sites
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Firefox 142 or later, Firefox 140.2 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
}
# HKLM:\Software\Policies\Mozilla\Firefox\Permissions\ScreenShare\Allow: List values: enter one value per line in the builder UI.
# No testable registry values are available for this state.
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Allowed Sites
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Firefox 142 or later, Firefox 140.2 ESR or later
$path = 'HKLM:\Software\Policies\Mozilla\Firefox\Permissions\ScreenShare\Allow'
New-Item -Path $path -Force | Out-Null
# List values: enter one value per line in the builder UI.SCCM scripts
# Exported from gporais.com
# Policy: Allowed Sites
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Firefox 142 or later, Firefox 140.2 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: Allowed Sites
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Firefox 142 or later, Firefox 140.2 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
}
# HKLM:\Software\Policies\Mozilla\Firefox\Permissions\ScreenShare\Allow: List values: enter one value per line in the builder UI.
# No testable registry values are available for this state.
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Allowed Sites
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Firefox 142 or later, Firefox 140.2 ESR or later
$path = 'HKLM:\Software\Policies\Mozilla\Firefox\Permissions\ScreenShare\Allow'
New-Item -Path $path -Force | Out-Null
# List values: enter one value per line in the builder UI.Building a multi-setting collection? Add this setting and generate combined .reg / PowerShell / GPO scripts.