Allow Url Regex List
Verified with Mozilla Firefox v8.2 — updated on July 12, 2026
Supported on: Firefox 138 or later
Path in the GPO console
Computer Configuration\Administrative Templates\Mozilla\Firefox\Content Analysis (DLP) User Configuration\Administrative Templates\Mozilla\Firefox\Content Analysis (DLP) Description
If this policy is enabled, you can specify a space-separated list of regular expressions that indicates URLs for which DLP operations will always be allowed without consulting the agent. The default is "^about:(?!blank|srcdoc).*", meaning that any pages that start with "about:" will be exempt from DLP except for "about:blank" and "about:srcdoc", as these can be controlled by web content. If this policy is disabled or not configured, the DLP agent will always be consulted.
Registry
HKLM
Software\Policies\Mozilla\Firefox\ContentAnalysis HKCU
Software\Policies\Mozilla\Firefox\ContentAnalysis 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: Allow Url Regex List
; State: Enabled
; Scope: Computer (HKLM)
; Supported on: Firefox 138 or later
[HKEY_LOCAL_MACHINE\Software\Policies\Mozilla\Firefox\ContentAnalysis]
"AllowUrlRegexList"=""More formats (PowerShell, Intune, SCCM)
PowerShell
# Exported from gporais.com
# Policy: Allow Url Regex List
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Firefox 138 or later
$path = 'HKLM:\Software\Policies\Mozilla\Firefox\ContentAnalysis'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'AllowUrlRegexList' -Value '' -Type StringIntune 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: Allow Url Regex List
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Firefox 138 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
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Mozilla\Firefox\ContentAnalysis' -Name 'AllowUrlRegexList' -Expected '' -Kind String)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Allow Url Regex List
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Firefox 138 or later
$path = 'HKLM:\Software\Policies\Mozilla\Firefox\ContentAnalysis'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'AllowUrlRegexList' -Value '' -Type StringSCCM scripts
# Exported from gporais.com
# Policy: Allow Url Regex List
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Firefox 138 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: Allow Url Regex List
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Firefox 138 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
}
$checks = @(
(Test-RegistryValue -Path 'HKLM:\Software\Policies\Mozilla\Firefox\ContentAnalysis' -Name 'AllowUrlRegexList' -Expected '' -Kind String)
)
if ($checks -notcontains $false) {
Write-Output 'Compliant'
exit 0
}
Write-Output 'Non-compliant'
exit 1
# === Remediation script ===
# Exported from gporais.com
# Policy: Allow Url Regex List
# State: Enabled
# Scope: Computer (HKLM)
# Supported on: Firefox 138 or later
$path = 'HKLM:\Software\Policies\Mozilla\Firefox\ContentAnalysis'
New-Item -Path $path -Force | Out-Null
Set-ItemProperty -Path $path -Name 'AllowUrlRegexList' -Value '' -Type StringBuilding a multi-setting collection? Add this setting and generate combined .reg / PowerShell / GPO scripts.