security.tls.hello_downgrade_check

If this policy is enabled, the preference is locked to true. If this policy is disabled, the preference is locked to false.

For a description of the preference, see:

https://github.com/mozilla/policy-templates/blob/master/README.md#preferences

Supported on: Firefox 72 or later, Firefox 68.4 ESR or later

Registry HiveHKEY_LOCAL_MACHINE or HKEY_CURRENT_USER
Registry PathSoftware\Policies\Mozilla\Firefox\Preferences
Value Namesecurity.tls.hello_downgrade_check
Value TypeREG_DWORD
Enabled Value1
Disabled Value0

firefox.admx

Administrative Templates (Computers)

Administrative Templates (Users)