> If there was a rogue web site launching service workers to do something nefarious how would I know diagnose what's happening ? What exactly are you supposing

> If there was a rogue web site launching service workers to do something nefarious how would I know diagnose what's happening ? What exactly are you supposing a service worker would be doing? They can't do huge downloads (the worker is shut down when there are no pages using it and it can only be reactivated by another browsing session or push message), can't receive push messages without showing a notification... there really is very little a service worker can do nefariously. It can, however, help improve battery life by allowing you to better control the offline experience, and not needlessly activate cell radios.