Maximum SSL version enabled

If this policy is enabled, Firefox will not use SSL/TLS versions greater than the value specified.

If this policy is disabled or not configured, Firefox defaults to a maximum of TLS 1.3.

Supported on: Firefox 66 or later, Firefox 60.6 ESR or later



  1. TLS 1.0
    Registry HiveHKEY_LOCAL_MACHINE or HKEY_CURRENT_USER
    Registry PathSoftware\Policies\Mozilla\Firefox
    Value NameSSLVersionMax
    Value TypeREG_SZ
    Valuetls1
  2. TLS 1.1
    Registry HiveHKEY_LOCAL_MACHINE or HKEY_CURRENT_USER
    Registry PathSoftware\Policies\Mozilla\Firefox
    Value NameSSLVersionMax
    Value TypeREG_SZ
    Valuetls1.1
  3. TLS 1.2
    Registry HiveHKEY_LOCAL_MACHINE or HKEY_CURRENT_USER
    Registry PathSoftware\Policies\Mozilla\Firefox
    Value NameSSLVersionMax
    Value TypeREG_SZ
    Valuetls1.2
  4. TLS 1.3
    Registry HiveHKEY_LOCAL_MACHINE or HKEY_CURRENT_USER
    Registry PathSoftware\Policies\Mozilla\Firefox
    Value NameSSLVersionMax
    Value TypeREG_SZ
    Valuetls1.3


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