Enable Site Isolation for specified origins

Computer and userIntune-readyIsolateOrigins

Supported on Microsoft Windows 7 or later

155.0.8059.85

What it does

Specify a list of origins that run in a dedicated process. On Android, this policy only works on devices with sufficient memory (strictly more than 3.2GB RAM), as isolating too many sites on resource-constrained devices may cause performance problems. For resource-constrained Android devices, please use IsolateOriginsShortlist instead. Devices with less than 1GB memory are not recommended to configure any process isolation specifically. Each named origin's process will only be allowed to contain documents from that origin and its subdomains. For example, specifying https://a1.example.com/ allows https://a2.a1.example.com/ in the same process, but not https://example.com or https://b.example.com. Since Google Chrome 77, you can also specify a range of origins to isolate using a wildcard. For example, specifying https://[*.]corp.example.com will give every origin underneath https://corp.example.com its own dedicated process, including https://corp.example.com itself, https://a1.corp.example.com, and https://a2.a1.corp.example.com. Note that all sites (i.e., scheme plus eTLD+1, such as https://example.com) are already isolated by default on Desktop platforms, as noted in the SitePerProcess policy. This IsolateOrigins policy is useful to isolate specific origins at a finer granularity (e.g., https://a.example.com). Note that Android isolates certain sensitive sites by default starting in Google Chrome version 77, and this policy extends that mode to isolate specific additional origins. Also note that origins isolated by this policy will be unable to script other origins in the same site, which is otherwise possible if two same-site documents modify their document.domain values to match. Administrators should confirm this uncommon behavior is not used on an origin before isolating it. Setting the policy to an empty string or leaving it unset means site isolation won't be required for any specific origins. Users can still turn on process isolation manually, through the command line flag. Example value: https://a.example.com/,https://othersite.org/,https://[*.]corp.example.com

What it writes

Hive: HKEY_LOCAL_MACHINE or HKEY_CURRENT_USER
Registry key: Software\Policies\Google\Chrome

Options

Option	Type	Registry value	Allowed values
Enable Site Isolation for specified origins	Text	`IsolateOrigins`	Up to 1000000 characters

Configure and deploy

Choose a state and the option values; the output below is generated from the template for exactly that.

Enabled · Computer · template defaults

Registry file (.reg)

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\Software\Policies\Google\Chrome]
"IsolateOrigins"=""

PowerShell

$ErrorActionPreference = 'Stop'

function Set-RegistryValue {
    param(
        [Parameter(Mandatory = $true)][string] $Path,
        [Parameter(Mandatory = $true)][string] $Name,
        [Parameter(Mandatory = $true)][string] $PropertyType,
        [Parameter(Mandatory = $true)][object] $Value
    )

    if (-not (Test-Path -LiteralPath $Path)) {
        New-Item -Path $Path -Force | Out-Null
    }

    New-ItemProperty -LiteralPath $Path -Name $Name -PropertyType $PropertyType -Value $Value -Force | Out-Null
}

function Remove-RegistryValue {
    param(
        [Parameter(Mandatory = $true)][string] $Path,
        [Parameter(Mandatory = $true)][string] $Name
    )

    if (Test-Path -LiteralPath $Path) {
        Remove-ItemProperty -LiteralPath $Path -Name $Name -Force -ErrorAction SilentlyContinue
    }
}

function Clear-RegistryKeyValues {
    param(
        [Parameter(Mandatory = $true)][string] $Path
    )

    if (-not (Test-Path -LiteralPath $Path)) {
        return
    }

    foreach ($propertyName in (Get-Item -LiteralPath $Path).Property) {
        Remove-ItemProperty -LiteralPath $Path -Name $propertyName -Force -ErrorAction SilentlyContinue
    }
}

# Policy: Enable Site Isolation for specified origins
# Name: IsolateOrigins
# Scope: Machine
# State: Enabled
# Source: chrome.admx

Set-RegistryValue -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Google\Chrome' -Name 'IsolateOrigins' -PropertyType 'String' -Value ''

The OMA-URI is an inferred ADMX-backed Policy CSP candidate derived from the source ADMX file name and policy name.
Some Microsoft policies use built-in Policy CSP pages whose area names don't match the ADMX file name, so verify the candidate against Microsoft Learn before deployment.
The generated payload is incomplete because one or more ADMX element values were not supplied: IsolateOrigins

ADMX profile candidate (OMA-URI)

./Device/Vendor/MSFT/Policy/Config/ADMX_chrome/IsolateOrigins

Intune remediation scripts

Detection

$ErrorActionPreference = 'Stop'
$reasons = [System.Collections.Generic.List[string]]::new()

function Test-RegistryValueExists {
    param(
        [Parameter(Mandatory = $true)][string] $Path,
        [Parameter(Mandatory = $true)][string] $Name
    )

    if (-not (Test-Path -LiteralPath $Path)) {
        return $false
    }

    return $null -ne (Get-ItemProperty -LiteralPath $Path -Name $Name -ErrorAction SilentlyContinue)
}

function Test-RegistryValueEquals {
    param(
        [Parameter(Mandatory = $true)][string] $Path,
        [Parameter(Mandatory = $true)][string] $Name,
        [Parameter(Mandatory = $true)][string] $Kind,
        [Parameter(Mandatory = $true)][object] $Expected
    )

    if (-not (Test-Path -LiteralPath $Path)) {
        return $false
    }

    $valueObject = Get-ItemProperty -LiteralPath $Path -Name $Name -ErrorAction SilentlyContinue
    if ($null -eq $valueObject) {
        return $false
    }

    $actual = $valueObject.$Name
    switch ($Kind) {
        'String' { return [string]$actual -ceq [string]$Expected }
        'ExpandString' { return [string]$actual -ceq [string]$Expected }
        'DWord' { return [uint32]$actual -eq [uint32]$Expected }
        'QWord' { return [uint64]$actual -eq [uint64]$Expected }
        'MultiString' {
            $actualArray = @($actual)
            $expectedArray = @($Expected)
            if ($actualArray.Count -ne $expectedArray.Count) { return $false }
            for ($index = 0; $index -lt $actualArray.Count; $index++) {
                if ([string]$actualArray[$index] -cne [string]$expectedArray[$index]) { return $false }
            }
            return $true
        }
        'Binary' {
            $actualArray = [byte[]]$actual
            $expectedArray = [byte[]]$Expected
            if ($actualArray.Length -ne $expectedArray.Length) { return $false }
            for ($index = 0; $index -lt $actualArray.Length; $index++) {
                if ($actualArray[$index] -ne $expectedArray[$index]) { return $false }
            }
            return $true
        }
        default { return [string]$actual -ceq [string]$Expected }
    }
}

# Policy: Enable Site Isolation for specified origins
# Name: IsolateOrigins
# Scope: Machine
# State: Enabled
# Source: chrome.admx

$isMatch = Test-RegistryValueEquals -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Google\Chrome' -Name 'IsolateOrigins' -Kind 'String' -Expected ''
if (-not $isMatch) {
    $reasons.Add('Value mismatch: HKEY_LOCAL_MACHINE\Software\Policies\Google\Chrome\IsolateOrigins') | Out-Null
}

if ($reasons.Count -eq 0) {
    Write-Output 'Compliant'
    exit 0
}

$reasons | ForEach-Object { Write-Output $_ }
exit 1

Remediation

$ErrorActionPreference = 'Stop'

function Set-RegistryValue {
    param(
        [Parameter(Mandatory = $true)][string] $Path,
        [Parameter(Mandatory = $true)][string] $Name,
        [Parameter(Mandatory = $true)][string] $PropertyType,
        [Parameter(Mandatory = $true)][object] $Value
    )

    if (-not (Test-Path -LiteralPath $Path)) {
        New-Item -Path $Path -Force | Out-Null
    }

    New-ItemProperty -LiteralPath $Path -Name $Name -PropertyType $PropertyType -Value $Value -Force | Out-Null
}

function Remove-RegistryValue {
    param(
        [Parameter(Mandatory = $true)][string] $Path,
        [Parameter(Mandatory = $true)][string] $Name
    )

    if (Test-Path -LiteralPath $Path) {
        Remove-ItemProperty -LiteralPath $Path -Name $Name -Force -ErrorAction SilentlyContinue
    }
}

function Clear-RegistryKeyValues {
    param(
        [Parameter(Mandatory = $true)][string] $Path
    )

    if (-not (Test-Path -LiteralPath $Path)) {
        return
    }

    foreach ($propertyName in (Get-Item -LiteralPath $Path).Property) {
        Remove-ItemProperty -LiteralPath $Path -Name $propertyName -Force -ErrorAction SilentlyContinue
    }
}

# Policy: Enable Site Isolation for specified origins
# Name: IsolateOrigins
# Scope: Machine
# State: Enabled
# Source: chrome.admx

Set-RegistryValue -Path 'Registry::HKEY_LOCAL_MACHINE\Software\Policies\Google\Chrome' -Name 'IsolateOrigins' -PropertyType 'String' -Value ''

History 1 retained release

155.0.8059.8519 Oct 2026
- Already present in the first release ChangeIntel keeps.

Template

Internal name: IsolateOrigins
Namespace: Google.Policies.Chrome
Template file: chrome.admx
Release: Google Chrome 155.0.8059.85 · file set 1f03ffd12695d620…

Definition, editor controls and support

Definition

<policy class="Both" displayName="$(string.IsolateOrigins)" explainText="$(string.IsolateOrigins_Explain)" key="Software\Policies\Google\Chrome" name="IsolateOrigins" presentation="$(presentation.IsolateOrigins)" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
      <parentCategory ref="Google.Policies.Chrome:googlechrome" />
      <supportedOn ref="Google.Policies.Chrome:SUPPORTED_WIN7" />
      <elements>
        <text id="IsolateOrigins" maxLength="1000000" valueName="IsolateOrigins" />
      </elements>
    </policy>

Editor controls

<presentation id="IsolateOrigins" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions"><textBox refId="IsolateOrigins"><label>Enable Site Isolation for specified origins</label></textBox></presentation>

Supported platforms and category

Google.Policies.Chrome:category:googlechrome
<category displayName="$(string.googlechrome)" name="googlechrome" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
      <parentCategory ref="Google.Policies:Cat_Google" />
    </category>
Google.Policies.Chrome:definition:SUPPORTED_WIN7
<definition displayName="$(string.SUPPORTED_WIN7)" name="SUPPORTED_WIN7" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions" />
Google.Policies:category:Cat_Google
<category displayName="$(string.google)" name="Cat_Google" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions" />
Google.Policies.Chrome:category:googlechrome
<category displayName="$(string.googlechrome)" name="googlechrome" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions">
      <parentCategory ref="Google.Policies:Cat_Google" />
    </category>
<strings><string id="Google.Policies.Chrome:googlechrome">Google Chrome</string></strings>
Google.Policies.Chrome:definition:SUPPORTED_WIN7
<definition displayName="$(string.SUPPORTED_WIN7)" name="SUPPORTED_WIN7" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions" />
<strings><string id="Google.Policies.Chrome:SUPPORTED_WIN7">Microsoft Windows 7 or later</string></strings>
Google.Policies:category:Cat_Google
<category displayName="$(string.google)" name="Cat_Google" xmlns="http://schemas.microsoft.com/GroupPolicy/2006/07/PolicyDefinitions" />
<strings><string id="Google.Policies:google">Google</string></strings>