Firefox Portable and Windows 10 Notifications

Hello.

I am using Firefox Portable 65.0.1 on Windows 10 Pro.
Since Firefox 64, notifications coming from it can use the Action Center on Windows 10.
On the about:config page "alerts.useSystemBackend" can be set to "true" so Firefox will use the Action Center to show notifications.

On Firefox Portable however, it does not work, only on installed versions.

Anyone knows a way to make use of the Action Center on Portable versions?

Thank you.