Minimum SSL version enabled: registry value SSLVersionMin (Firefox)UserHKCU\Software\Policies\Mozilla\Firefox

Policy ID: SSLVersionMin
Scope: Computer Configuration, User Configuration
Supported on: Firefox 66 or later, Firefox 60.6 ESR or later
Source: Mozilla Firefox Policy Templates (version 8.3)
Category: Mozilla › Firefox

Registry

SSLVersionMin

REG_SZUserComputer

…\Software\Policies\Mozilla\FirefoxHKCU\Software\Policies\Mozilla\Firefox Current key
HKLM\Software\Policies\Mozilla\Firefox

Enabled value: Depends on the option value
Element: -

Options
Item	Stored value
TLS 1.0	tls1
TLS 1.1	tls1.1
TLS 1.2	tls1.2
TLS 1.3	tls1.3

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)
; TLS 1.0
"SSLVersionMin"="tls1"
; TLS 1.1
"SSLVersionMin"="tls1.1"
; TLS 1.2
"SSLVersionMin"="tls1.2"
; TLS 1.3
"SSLVersionMin"="tls1.3"

CMD

:: Options (use only one)

:: TLS 1.0
reg add "HKCU\Software\Policies\Mozilla\Firefox" /v "SSLVersionMin" /t REG_SZ /d "tls1" /f
:: TLS 1.1
reg add "HKCU\Software\Policies\Mozilla\Firefox" /v "SSLVersionMin" /t REG_SZ /d "tls1.1" /f
:: TLS 1.2
reg add "HKCU\Software\Policies\Mozilla\Firefox" /v "SSLVersionMin" /t REG_SZ /d "tls1.2" /f
:: TLS 1.3
reg add "HKCU\Software\Policies\Mozilla\Firefox" /v "SSLVersionMin" /t REG_SZ /d "tls1.3" /f

PowerShell

# Common: create the key
New-Item -Path 'HKCU:\Software\Policies\Mozilla\Firefox' -Force | Out-Null

# Options (use only one)
# TLS 1.0
New-ItemProperty -Path 'HKCU:\Software\Policies\Mozilla\Firefox' -Name 'SSLVersionMin' -PropertyType String -Value 'tls1' -Force | Out-Null
# TLS 1.1
New-ItemProperty -Path 'HKCU:\Software\Policies\Mozilla\Firefox' -Name 'SSLVersionMin' -PropertyType String -Value 'tls1.1' -Force | Out-Null
# TLS 1.2
New-ItemProperty -Path 'HKCU:\Software\Policies\Mozilla\Firefox' -Name 'SSLVersionMin' -PropertyType String -Value 'tls1.2' -Force | Out-Null
# TLS 1.3
New-ItemProperty -Path 'HKCU:\Software\Policies\Mozilla\Firefox' -Name 'SSLVersionMin' -PropertyType String -Value 'tls1.3' -Force | Out-Null

ComputerMachine-wide setting

.reg

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\Software\Policies\Mozilla\Firefox]

; Options (use only one)
; TLS 1.0
"SSLVersionMin"="tls1"
; TLS 1.1
"SSLVersionMin"="tls1.1"
; TLS 1.2
"SSLVersionMin"="tls1.2"
; TLS 1.3
"SSLVersionMin"="tls1.3"

CMD

:: Options (use only one)

:: TLS 1.0
reg add "HKLM\Software\Policies\Mozilla\Firefox" /v "SSLVersionMin" /t REG_SZ /d "tls1" /f
:: TLS 1.1
reg add "HKLM\Software\Policies\Mozilla\Firefox" /v "SSLVersionMin" /t REG_SZ /d "tls1.1" /f
:: TLS 1.2
reg add "HKLM\Software\Policies\Mozilla\Firefox" /v "SSLVersionMin" /t REG_SZ /d "tls1.2" /f
:: TLS 1.3
reg add "HKLM\Software\Policies\Mozilla\Firefox" /v "SSLVersionMin" /t REG_SZ /d "tls1.3" /f

PowerShell

# Common: create the key
New-Item -Path 'HKLM:\Software\Policies\Mozilla\Firefox' -Force | Out-Null

# Options (use only one)
# TLS 1.0
New-ItemProperty -Path 'HKLM:\Software\Policies\Mozilla\Firefox' -Name 'SSLVersionMin' -PropertyType String -Value 'tls1' -Force | Out-Null
# TLS 1.1
New-ItemProperty -Path 'HKLM:\Software\Policies\Mozilla\Firefox' -Name 'SSLVersionMin' -PropertyType String -Value 'tls1.1' -Force | Out-Null
# TLS 1.2
New-ItemProperty -Path 'HKLM:\Software\Policies\Mozilla\Firefox' -Name 'SSLVersionMin' -PropertyType String -Value 'tls1.2' -Force | Out-Null
# TLS 1.3
New-ItemProperty -Path 'HKLM:\Software\Policies\Mozilla\Firefox' -Name 'SSLVersionMin' -PropertyType String -Value 'tls1.3' -Force | Out-Null