Disable Private Browsing
Supported on: Firefox 60 or later, Firefox 60 ESR or later
Registry
HKLM
Software\Policies\Mozilla\Firefox HKCU
Software\Policies\Mozilla\Firefox Value name: DisablePrivateBrowsing
Enabled: DisablePrivateBrowsing = 1
Disabled: DisablePrivateBrowsing = 0
Description
If this policy is enabled, private browsing is not allowed. If this policy is disabled or not configured, private browsing is allowed.