Website Filter (JSON on one line)

Supported on: Firefox 114 or later, Firefox 102.12 ESR or later

Registry

HKLM Software\Policies\Mozilla\Firefox

HKCU Software\Policies\Mozilla\Firefox

Options

WebsiteFilter text

Description

If this policy is enabled, you can specify blocked sites and exceptions via JSON. If this policy is disabled or not configured, websites are not filtered.