Include information about privacy and administration

[eloyesp]

This seems to be the main source of information about ServiceWorker, but there is no information for the user, how is the user informed about service worker usage in different browsers (does the browser ask a question or show an icon), or how does it manage (does the browser gives the user any option to manage or manually unregister service workers).

This kind of info could be useful both to developers and to users, and is absent almost everywhere. The only resource I found about this is: https://www.ghacks.net/2016/03/02/manage-service-workers-in-firefox-and-chrome/ .