Block about:config
Supported on: Firefox 60 or later, Firefox 60 ESR or later
Registry
HKLM
Software\Policies\Mozilla\Firefox HKCU
Software\Policies\Mozilla\Firefox Value name: BlockAboutConfig
Enabled: BlockAboutConfig = 1
Disabled: BlockAboutConfig = 0
Description
If this policy is enabled, the user cannot access about:config. If this policy is disabled or not configured, the user can access about:config.