How to clear a Service Worker cache in Firefox?

In Chrome it is possible to clear the Service Worker cache from the Dev Tools.

How can we achieve that in Firefox?

I've tried so far:

• to unregister the service in about:serviceworkers
• to empty the cache under about:preferences#privacy
• to reload the page with Ctrl + F5

but it's still there...

As mentioned above, it is not possible right now. But deleting Cache entries and Caches has been implemented and should roll out soone (https://bugzilla.mozilla.org/show_bug.cgi?id=1304297). And it is already available in Firefox Developer Edition, for example.