api.Navigator.serviceWorker - supported in Firefox Private since 139

[marto55555]

What type of issue is this?

Incorrect support data (example: BrowserX says "86" but support was added in "40")

What information was incorrect, unhelpful, or incomplete?

This In Firefox private windows, the serviceWorker object is undefined. See [bug 1320796](https://bugzil.la/1320796) note is no longer correct. Support in Private windows was added in Firefox 139: https://bugzilla.mozilla.org/show_bug.cgi?id=1959535

What browsers does this problem apply to, if applicable?

No response

What did you expect to see?

The note should only apply to old Firefox versions <139.

Did you test this? If so, how?

Yes, ('serviceWorker' in navigator) now returns true in Firefox Private windows.

Can you link to any release notes, bugs, pull requests, or MDN pages related to this?

https://bugzilla.mozilla.org/show_bug.cgi?id=1959535

Do you have anything more you want to share?

No response

MDN URL

https://developer.mozilla.org/en-US/docs/Web/API/Navigator/serviceWorker

MDN metadata

MDN page report details

• Query: api.Navigator.serviceWorker
• Report started: 2026-03-30T09:44:01.770Z

[caugner]

Thanks, all we need to do is here to update the note to start with "Before Firefox 139, ...", and to end with "See bug xxx.".