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FF139Relnote - Reenable Prioritized Scheduling API #39395

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hamishwillee merged 2 commits into from
May 6, 2025
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FF139Relnote - Reenable Prioritized Scheduling API #39395

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FF139Relnote: Expr reenable Prioritized Scheduling API
hamishwillee May 5, 2025
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Update files/en-us/mozilla/firefox/releases/139/index.md
hamishwillee May 6, 2025
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4 changes: 4 additions & 0 deletions files/en-us/mozilla/firefox/releases/139/index.md
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Expand Up @@ -72,6 +72,10 @@ This article provides information about the changes in Firefox 139 that affect d

These features are newly shipped in Firefox 139 but are disabled by default. To experiment with them, search for the appropriate preference on the `about:config` page and set it to `true`. You can find more such features on the [Experimental features](/en-US/docs/Mozilla/Firefox/Experimental_features) page.

- **Prioritized Task Scheduling API** (Nightly release).
The [Prioritized Task Scheduling API](/en-US/docs/Web/API/Prioritized_Task_Scheduling_API) provides a standardized way to prioritize all tasks belonging to an application, whether they defined in a website developer's code, or in third party libraries and frameworks.
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This adds support for the {{domxref("scheduler.yield()")}} method and re-enables the whole API in the Nightly release.
([Firefox bug 1958943](https://bugzil.la/1958943), [Firefox bug 1920115](https://bugzil.la/1920115)).
- **Support for escaping `<` and `>` in attributes when serializing HTML**: `dom.security.html_serialization_escape_lt_gt`.
Firefox now replaces the `<` and `>` characters with `&lt;` and `&gt;`, respectively, in attributes when serializing HTML. This helps prevent certain exploits where HTML is serialized and then injected back into the DOM.
The affected methods and properties are: {{domxref("Element.innerHTML")}}, {{domxref("Element.outerHTML")}}, {{domxref("Element.getHTML()")}}, {{domxref("ShadowRoot.innerHTML")}}, and {{domxref("ShadowRoot.getHTML()")}}. ([Firefox bug 1941347](https://bugzil.la/1941347)).
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