My reply to https://helloanselm.com/2016/open-service-worker-questions/, which sets a new record for false statements per word.
The first thing I noticed after making sure that Service Worker are enabled (Chrome is behind flags)
No they're not. They've been in stable for over a year now.
was that I found no user setting or any hint in the developer tools about service workers
There's a service worker panel in the sources tab and in the resources tab. There's also
chrome://serviceworker-internals/. The script also appears in the context dropdown (as iframes do). The script itself also appears in the sources panel. You can also type
navigator.serviceWorker.controller into the console to inspect the controlling service worker for the page.