Firefox Nightly: cannot disable certificate validation for Service Workers

Question

I tried to disable certificate validation for service workers on Firefox Nightly setting:

dom.serviceWorkers.testing.enabled: true
dom.webnotifications.serviceworker.enabled: true
devtools.serviceWorkers.testing.enabled: true
dom.serviceWorkers.enabled: true

in about:config tab.

I restarted Firefox, but I still get an exception on ServiceWorking registration caused by user settings limitations.

What can I do more?