Control use of the Web Serial API: registry value DefaultSerialGuardSettingUserHKCU\Software\Policies\Mozilla\Firefox
- Policy ID
- DefaultSerialGuardSetting
- Scope
- Computer Configuration, User Configuration
- Supported on
- Firefox 151 or later
- Source
- Mozilla Firefox Policy Templates (version 8.3)
- Category
- Mozilla › Firefox
Registry
DefaultSerialGuardSetting
REG_DWORDUserComputer…\Software\Policies\Mozilla\FirefoxHKCU\Software\Policies\Mozilla\Firefox Current key
HKLM\Software\Policies\Mozilla\Firefox
HKLM\Software\Policies\Mozilla\Firefox
- Enabled value
- Depends on the option value
- Element
- -
| Item | Stored value |
|---|---|
| Do not allow any site to request access to serial ports via the Web Serial API | 2 |
| Allow sites to ask the user to grant access to a serial port | 3 |
Apply with .reg · CMD · PowerShell
UserPer-account setting
.reg
Windows Registry Editor Version 5.00 [HKEY_CURRENT_USER\Software\Policies\Mozilla\Firefox] ; Options (use only one) ; Do not allow any site to request access to serial ports via the Web Serial API "DefaultSerialGuardSetting"=dword:00000002 ; Allow sites to ask the user to grant access to a serial port "DefaultSerialGuardSetting"=dword:00000003
CMD
:: Options (use only one) :: Do not allow any site to request access to serial ports via the Web Serial API reg add "HKCU\Software\Policies\Mozilla\Firefox" /v "DefaultSerialGuardSetting" /t REG_DWORD /d 2 /f :: Allow sites to ask the user to grant access to a serial port reg add "HKCU\Software\Policies\Mozilla\Firefox" /v "DefaultSerialGuardSetting" /t REG_DWORD /d 3 /f
PowerShell
# Common: create the key New-Item -Path 'HKCU:\Software\Policies\Mozilla\Firefox' -Force | Out-Null # Options (use only one) # Do not allow any site to request access to serial ports via the Web Serial API New-ItemProperty -Path 'HKCU:\Software\Policies\Mozilla\Firefox' -Name 'DefaultSerialGuardSetting' -PropertyType DWord -Value 2 -Force | Out-Null # Allow sites to ask the user to grant access to a serial port New-ItemProperty -Path 'HKCU:\Software\Policies\Mozilla\Firefox' -Name 'DefaultSerialGuardSetting' -PropertyType DWord -Value 3 -Force | Out-Null
ComputerMachine-wide setting
.reg
Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\Software\Policies\Mozilla\Firefox] ; Options (use only one) ; Do not allow any site to request access to serial ports via the Web Serial API "DefaultSerialGuardSetting"=dword:00000002 ; Allow sites to ask the user to grant access to a serial port "DefaultSerialGuardSetting"=dword:00000003
CMD
:: Options (use only one) :: Do not allow any site to request access to serial ports via the Web Serial API reg add "HKLM\Software\Policies\Mozilla\Firefox" /v "DefaultSerialGuardSetting" /t REG_DWORD /d 2 /f :: Allow sites to ask the user to grant access to a serial port reg add "HKLM\Software\Policies\Mozilla\Firefox" /v "DefaultSerialGuardSetting" /t REG_DWORD /d 3 /f
PowerShell
# Common: create the key New-Item -Path 'HKLM:\Software\Policies\Mozilla\Firefox' -Force | Out-Null # Options (use only one) # Do not allow any site to request access to serial ports via the Web Serial API New-ItemProperty -Path 'HKLM:\Software\Policies\Mozilla\Firefox' -Name 'DefaultSerialGuardSetting' -PropertyType DWord -Value 2 -Force | Out-Null # Allow sites to ask the user to grant access to a serial port New-ItemProperty -Path 'HKLM:\Software\Policies\Mozilla\Firefox' -Name 'DefaultSerialGuardSetting' -PropertyType DWord -Value 3 -Force | Out-Null