This is an amendment to my previous email on the topic; I forgot to follow the standard template.
(Changes: follows standard template)
As of Firefox 147, I plan to ship support for module scripts for service workers (Bugzilla). This long requested feature addresses a change to allow the register() method on service workers to support ES module scripts.
I encourage you to go and try it out as it's currently available in nightly and enabled by default.
Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1360870
Specification: https://www.w3.org/TR/service-workers/ https://web-platform-dx.github.io/web-features-explorer/features/js-modules-service-workers/
Platform coverage: All
Preference: None, available by default
Other Browsers: Both Chromium and Webkit have supported this for a long time.
Standards position: https://github.com/mozilla/standards-positions/issues/499