Auto Launch Protocols From Origins
Supported on: Firefox 81 or later, Firefox 78.3 ESR or later
Registry
HKLM
Software\Policies\Mozilla\Firefox HKCU
Software\Policies\Mozilla\Firefox Options
AutoLaunchProtocolsFromOrigins multiText Description
If this policy is enabled, you can define a list of external protocols that can be used from listed origins without prompting the user. If this policy is disabled or not configured, any site that invokes an external protocol will ask the user for permission. For detailed information on creating the policy, see https://github.com/mozilla/policy-templates/blob/master/README.md#autolaunchprotocolsfromorigins.