Handlers (JSON on one line)
Supported on: Firefox 78 or later
Registry
HKLM
Software\Policies\Mozilla\Firefox HKCU
Software\Policies\Mozilla\Firefox Options
Handlers text Description
If this policy is enabled, you can use JSON to configure default application handlers. If this policy is disabled or not configured, Firefox defaults are used. For detailed information on creating the policy, see https://github.com/mozilla/policy-templates/blob/master/README.md#handlers.