getRegistration

[hjri]

Bug Report or Feature Request (mark with an x)

- [x] bug report -> please search issues before submitting
- [x] feature request

Versions.

browser: Firefox 
browser version: Nightly 65 
operating system: Debian
webpack version: doesn't matter

Repro steps.

no steps

Desired or expected functionality

add getRegistration() and/or getRegistrations(). without it it seem to be impossible to remove service worker registration.

Mention any other details that might be useful.