Blocked Sites

Supported on: Firefox 74 or later, Firefox 68.6 ESR or later

Registry

HKLM Software\Policies\Mozilla\Firefox\Permissions

HKCU Software\Policies\Mozilla\Firefox\Permissions

Options

List (registry values) list - list under Software\Policies\Mozilla\Firefox\Permissions\Autoplay\Block

Description

If this policy is enabled, autoplay is always blocked for the origins indicated. If this policy is disabled or not configured, the default autoplay policy is followed.