Intent to Ship: Module Service Workers

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Harveer Singh

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Nov 18, 2025, 1:43:18 PMNov 18
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As of Firefox 147, I plan to ship support for module scripts for service workers (Bugzilla). This has been a long requested feature so if any of you have been waiting on this; I encourage you to go and try it out as it's currently in nightly and enabled by default.

Both Chromium and Webkit already support this from long time.


In case there are any questions, please feel free to reach out.

Harveer Singh

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Nov 24, 2025, 10:38:25 AMNov 24
to dev-pl...@mozilla.org

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



In case there are any questions, please feel free to reach out.

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