Keep cookies until Firefox is closed
Verified with Mozilla Firefox v8.2 — updated on July 10, 2026
Supported on: Firefox 60 or later, Firefox 60 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 and cookies are allowed, they will expire when Firefox is closed. This setting is ignored if this policy is disabled or not configured or if cookies are not allowed.
Registry
HKLM
Software\Policies\Mozilla\Firefox\Cookies HKCU
Software\Policies\Mozilla\Firefox\Cookies Value name: ExpireAtSessionEnd
Enabled: ExpireAtSessionEnd = 1
Disabled: ExpireAtSessionEnd = 0
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: Keep cookies until Firefox is closed
; State: Enabled
; Scope: Computer (HKLM)
; Supported on: Firefox 60 or later, Firefox 60 ESR or later
[HKEY_LOCAL_MACHINE\Software\Policies\Mozilla\Firefox\Cookies]
"ExpireAtSessionEnd"=dword:00000001More formats (PowerShell, Intune, SCCM)
PowerShell
# Exported from gporais.com
# Policy: Keep cookies until Firefox is closed
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Firefox 60 or later, Firefox 60 ESR or later
$path = 'HKLM:\Software\Policies\Mozilla\Firefox\Cookies'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'ExpireAtSessionEnd' -Value 1 -Type DWordIntune 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: Keep cookies until Firefox is closed
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Firefox 60 or later, Firefox 60 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
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Mozilla\Firefox\Cookies' -Name 'ExpireAtSessionEnd' -Expected 1 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Keep cookies until Firefox is closed
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Firefox 60 or later, Firefox 60 ESR or later
$path = 'HKLM:\Software\Policies\Mozilla\Firefox\Cookies'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'ExpireAtSessionEnd' -Value 1 -Type DWordSCCM scripts
# Exported from gporais.com
# Policy: Keep cookies until Firefox is closed
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Firefox 60 or later, Firefox 60 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: Keep cookies until Firefox is closed
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Firefox 60 or later, Firefox 60 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
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Mozilla\Firefox\Cookies' -Name 'ExpireAtSessionEnd' -Expected 1 -Kind DWord)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Keep cookies until Firefox is closed
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Firefox 60 or later, Firefox 60 ESR or later
$path = 'HKLM:\Software\Policies\Mozilla\Firefox\Cookies'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'ExpireAtSessionEnd' -Value 1 -Type DWordBuilding a multi-setting collection? Add this setting and generate combined .reg / PowerShell / GPO scripts.