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Update Firefox 150 release notes for WebDriver conforming changes#43806

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juliandescottes merged 2 commits intomdn:mainfrom
juliandescottes:webdriver-firefox-150
Apr 16, 2026
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Update Firefox 150 release notes for WebDriver conforming changes#43806
juliandescottes merged 2 commits intomdn:mainfrom
juliandescottes:webdriver-firefox-150

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@juliandescottes juliandescottes commented Apr 16, 2026

Release notes update based on the following list of relnote worthy bugs.

(needs review from @whimboo / @lutien before merging)

@juliandescottes juliandescottes requested a review from a team as a code owner April 16, 2026 05:05
@juliandescottes juliandescottes requested review from dipikabh and removed request for a team April 16, 2026 05:05
@github-actions github-actions bot added Content:Firefox Content in the Mozilla/Firefox subtree size/s [PR only] 6-50 LoC changed labels Apr 16, 2026
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github-actions bot commented Apr 16, 2026

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URL: /en-US/docs/Mozilla/Firefox/Releases/150
Title: Firefox 150 release notes for developers (Beta)

(comment last updated: 2026-04-16 20:49:52)

Comment thread files/en-us/mozilla/firefox/releases/150/index.md Outdated

- Added the `emulation.setNetworkConditions` command, which only supports the `type: offline` at the moment. Using this, you can emulate offline mode either on specific browsing contexts, on user contexts (a.k.a. containers) or globally. ([Firefox bug 1993079](https://bugzil.la/1993079))
- Improved our support for non utf-8 header values across all the `network` module commands and events. They are now properly serialized to `BytesValue`. ([Firefox bug 1994996](https://bugzil.la/1994996))
- Fixed a bug with download events, which would be missing the `navigation` property when triggered by a link with `target="_blank"`. ([Firefox bug 1999481](https://bugzil.la/1999481))
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We should probably add that it's only about downloads triggered by the Content-Disposition header, since generally downloads coming from the link do not trigger the navigation (sorry, the bug title was misleading, I've updated it).

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Rephrased.

Comment thread files/en-us/mozilla/firefox/releases/150/index.md Outdated
Comment thread files/en-us/mozilla/firefox/releases/150/index.md Outdated
@juliandescottes juliandescottes requested a review from lutien April 16, 2026 07:57
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Thanks for the review @lutien
I rephrased some of the sentences, can you check again?

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Perfect! Thank you!

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Overall looks good. Just some minor things to address. Thanks Julian!

Comment thread files/en-us/mozilla/firefox/releases/150/index.md Outdated
Comment thread files/en-us/mozilla/firefox/releases/150/index.md Outdated
Comment thread files/en-us/mozilla/firefox/releases/150/index.md Outdated
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Thanks for the review, comments should all be addressed now.

@juliandescottes juliandescottes merged commit 499ed15 into mdn:main Apr 16, 2026
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4 participants