Allowed Sites (Session Only)
Verified with Mozilla Firefox v8.2 — updated on July 10, 2026
Supported on: Firefox 79 or later, Firefox 78.1 ESR or later
Path in the GPO console
Computer Configuration\Administrative Templates\Mozilla\Firefox\Cookies User Configuration\Administrative Templates\Mozilla\Firefox\Cookies Description
If this policy is enabled, cookies are allowed for the origins indicated, but removed at the end of the session. If a top level domain is specified (http://example.org), cookies are allowed for all subdomains as well. If this policy is disabled or not configured, the default cookie policy is followed.
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: Allowed Sites (Session Only)
; State: Enabled
; Scope: Computer (HKLM)
; Supported on: Firefox 79 or later, Firefox 78.1 ESR or later
[HKEY_LOCAL_MACHINE\Software\Policies\Mozilla\Firefox\Cookies\AllowSession]
; List values: enter one value per line in the builder UI.More formats (PowerShell, Intune, SCCM)
PowerShell
# Exported from gporais.com
# Policy: Allowed Sites (Session Only)
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Firefox 79 or later, Firefox 78.1 ESR or later
$path = 'HKLM:\Software\Policies\Mozilla\Firefox\Cookies\AllowSession'
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 (Session Only)
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Firefox 79 or later, Firefox 78.1 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\Cookies\AllowSession: 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 (Session Only)
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Firefox 79 or later, Firefox 78.1 ESR or later
$path = 'HKLM:\Software\Policies\Mozilla\Firefox\Cookies\AllowSession'
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 (Session Only)
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Firefox 79 or later, Firefox 78.1 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 (Session Only)
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Firefox 79 or later, Firefox 78.1 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\Cookies\AllowSession: 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 (Session Only)
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Firefox 79 or later, Firefox 78.1 ESR or later
$path = 'HKLM:\Software\Policies\Mozilla\Firefox\Cookies\AllowSession'
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.