FF142 Relnote/Expr: Prioritized task scheduling API #40553

hamishwillee · 2025-07-28T02:15:51Z

FF142 supports the Prioritized Task Scheduling AP in https://bugzilla.mozilla.org/show_bug.cgi?id=1966997

This adds a release note and removes the experimental features entry.

Related docs work can be tracked in #40484

hamishwillee · 2025-07-28T02:16:31Z

files/en-us/mozilla/firefox/releases/142/index.md

@@ -53,6 +53,11 @@ Firefox 142 is the current [Beta version of Firefox](https://www.firefox.com/en-
 #### DOM

 - The {{domxref("Selection.getComposedRanges()")}} method is now supported, allowing developers to accurately get selected text ranges across shadow DOM boundaries. In addition, the methods {{domxref("Selection.setBaseAndExtent()","setBaseAndExtent()")}}, {{domxref("Selection.collapse()","collapse()")}}, and {{domxref("Selection.extend()","extend()")}} of the {{domxref("Selection")}} interface have been modified to accept nodes inside a shadow root. ([Firefox bug 1903870](https://bugzil.la/1903870)).
+- The [Prioritized Task Scheduling API](/en-US/docs/Web/API/Prioritized_Task_Scheduling_API) is now supported, providing a standardized mechanism to assign and manage task priorities for an application.
+  The supported interfaces include: {{domxref("Scheduler")}}, {{domxref("TaskController")}}, {{domxref("TaskSignal")}}, {{domxref("TaskPriorityChangeEvent")}} (and the {{domxref("TaskSignal/prioritychange_event","prioritychange")}} event), and the properties {{domxref("Window.scheduler")}} and {{domxref("WorkerGlobalScope.scheduler")}}.
+  The {{domxref("Scheduling")}} interface and {{domxref("Navigator.scheduling")}} property are not supported.


Note, these two are not supported, which is why I've explicitly listed out all the interfaces that are supported too.

files/en-us/mozilla/firefox/releases/142/index.md

github-actions · 2025-07-28T02:18:03Z

Preview URLs

Flaws (6)

URL: /en-US/docs/Mozilla/Firefox/Experimental_features
Title: Experimental features in Firefox
Flaw count: 3

broken_links:
- Can't resolve /en-US/docs/Web/CSS/:heading_function#functional_notation
macros:
- Can't resolve /en-US/docs/Web/CSS/:heading
- Can't resolve /en-US/docs/Web/CSS/:heading_function

URL: /en-US/docs/Mozilla/Firefox/Releases/142
Title: Firefox 142 for developers
Flaw count: 3

broken_links:
- Can't resolve /en-US/docs/Web/CSS/:heading_function#functional_notation
macros:
- Can't resolve /en-US/docs/Web/CSS/:heading
- Can't resolve /en-US/docs/Web/CSS/:heading_function

External URLs (73)

URL: /en-US/docs/Mozilla/Firefox/Experimental_features
Title: Experimental features in Firefox

https://bugzil.la/1057233 (1 time)
https://bugzil.la/1099557 (1 time)
https://bugzil.la/1223880 (1 time)
https://bugzil.la/1225110 (1 time)
https://bugzil.la/1280613 (1 time)
https://bugzil.la/1312588 (1 time)
https://bugzil.la/1318984 (1 time)
https://bugzil.la/1391243 (1 time)
https://bugzil.la/1467846 (1 time)
https://bugzil.la/1539075 (1 time)
https://bugzil.la/1602129 (1 time)
https://bugzil.la/1617609 (1 time)
https://bugzil.la/1676779 (1 time)
https://bugzil.la/1676791 (1 time)
https://bugzil.la/1687364 (1 time)
https://bugzil.la/1697647 (1 time)
https://bugzil.la/1736914 (1 time)
https://bugzil.la/1737918 (1 time)
https://bugzil.la/1737920 (1 time)
https://bugzil.la/1750902 (1 time)
https://bugzil.la/1754897 (1 time)
https://bugzil.la/1794475 (1 time)
https://bugzil.la/1794628 (1 time)
https://bugzil.la/1804573 (1 time)
https://bugzil.la/1807685 (1 time)
https://bugzil.la/1808410 (1 time)
https://bugzil.la/1809005 (1 time)
https://bugzil.la/1817303 (1 time)
https://bugzil.la/1823463 (1 time)
https://bugzil.la/1838746 (1 time)
https://bugzil.la/1853418 (1 time)
https://bugzil.la/1855763 (1 time)
https://bugzil.la/1884424 (1 time)
https://bugzil.la/1884425 (1 time)
https://bugzil.la/1886134 (1 time)
https://bugzil.la/1886441 (1 time)
https://bugzil.la/1888729 (1 time)
https://bugzil.la/1889561 (1 time)
https://bugzil.la/1891446 (1 time)
https://bugzil.la/1900929 (1 time)
https://bugzil.la/1901037 (1 time)
https://bugzil.la/1905706 (1 time)
https://bugzil.la/1906301 (1 time)
https://bugzil.la/1917783 (1 time)
https://bugzil.la/1917784 (1 time)
https://bugzil.la/1931290 (1 time)
https://bugzil.la/1934683 (1 time)
https://bugzil.la/1950759 (1 time)
https://bugzil.la/1953557 (1 time)
https://bugzil.la/1954685 (1 time)
https://bugzil.la/1956140 (1 time)
https://bugzil.la/1963263 (1 time)
https://bugzil.la/1972610 (1 time)
https://bugzil.la/1974386 (1 time)
https://bugzil.la/1976656 (1 time)
https://bugzil.la/502258 (1 time)
https://bugzil.la/558594 (1 time)
https://bugzil.la/778617 (1 time)
https://bugzil.la/917755 (1 time)
https://bugzil.la/918189 (1 time)
https://bugzilla.mozilla.org (1 time)
https://drafts.csswg.org/css-inline/ (1 time)
https://en.wikipedia.org/wiki/Graphics_Processing_Unit (1 time)
https://github.com/mozilla/explainers/tree/main/archive/ppa-experiment (1 time)
https://jpeg.org/jpegxl/ (1 time)
https://support.mozilla.org/en-US/kb/about-config-editor-firefox (1 time)
https://support.mozilla.org/en-US/kb/privacy-preserving-attribution (1 time)
https://w3c.github.io/ppa/ (1 time)
https://wiki.mozilla.org/Origin_Trials (1 time)
https://www.firefox.com/en-US/ (1 time)
https://www.firefox.com/en-US/channel/desktop/ (3 times)
https://www.firefox.com/en-US/channel/desktop/developer/ (2 times)

URL: /en-US/docs/Mozilla/Firefox/Releases/142
Title: Firefox 142 for developers

https://bugzil.la/1966997 (1 time) (Note! This may be a new URL 👀)

(comment last updated: 2025-08-15 03:48:19)

github-actions · 2025-08-08T01:15:23Z

This pull request has merge conflicts that must be resolved before it can be merged.

dipikabh

Thanks!

files/en-us/mozilla/firefox/releases/142/index.md

Co-authored-by: Dipika Bhattacharya <dipika@foss-community.org>

* FF142 Relnote/Expr: Prioritized task scheduling API * Update files/en-us/mozilla/firefox/releases/142/index.md Co-authored-by: Dipika Bhattacharya <dipika@foss-community.org> --------- Co-authored-by: Dipika Bhattacharya <dipika@foss-community.org>

hamishwillee requested a review from a team as a code owner July 28, 2025 02:15

hamishwillee requested review from pepelsbey and removed request for a team July 28, 2025 02:15

github-actions bot added Content:Firefox Content in the Mozilla/Firefox subtree size/s [PR only] 6-50 LoC changed labels Jul 28, 2025

hamishwillee commented Jul 28, 2025

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[WebAPI] Ship Prioritized Task Scheduling API #40484

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hamishwillee requested a review from bsmth August 4, 2025 02:11

hamishwillee force-pushed the ff142_ship_prioritized_task_scheduling branch from ee65e88 to a237e84 Compare August 4, 2025 02:12

github-actions bot added the merge conflicts 🚧 [PR only] label Aug 8, 2025

hamishwillee force-pushed the ff142_ship_prioritized_task_scheduling branch from a237e84 to 4d009fa Compare August 8, 2025 01:19

github-actions bot removed the merge conflicts 🚧 [PR only] label Aug 8, 2025

FF142 Relnote/Expr: Prioritized task scheduling API

0d20c8b

hamishwillee force-pushed the ff142_ship_prioritized_task_scheduling branch from 4d009fa to 0d20c8b Compare August 15, 2025 01:44

dipikabh approved these changes Aug 15, 2025

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Update files/en-us/mozilla/firefox/releases/142/index.md

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Co-authored-by: Dipika Bhattacharya <dipika@foss-community.org>

hamishwillee merged commit ac458df into mdn:main Aug 15, 2025
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hamishwillee deleted the ff142_ship_prioritized_task_scheduling branch August 15, 2025 03:48

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