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Firefox 85 release notes for developers

files/en-us/mozilla/firefox/releases/85/index.md

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This article provides information about the changes in Firefox 85 that will affect developers. Firefox 85 was released on January 26, 2021.

[!NOTE] See also January brings us Firefox 85 on Mozilla Hacks.

Changes for web developers

Developer Tools

  • Developers can now use the Page Inspector to toggle the {{cssxref(":focus-visible")}} pseudo-class for the currently selected element (in addition to the pseudo classes that were previously supported: {{cssxref(":hover")}}, {{cssxref(":active")}} and {{cssxref(":focus")}}, {{cssxref(":focus-within")}}, and {{cssxref(":visited")}}). (Firefox bug 1617608).

HTML

Removals

  • The <menuitem> HTML element is no longer available — it has been hidden behind the dom.menuitem.enabled flag. (Firefox bug 1680596).

CSS

  • The {{cssxref(":focus-visible")}} pseudo-class is now enabled. (Firefox bug 1445482).
  • The pinch-zoom value for the {{cssxref("touch-action")}} property is now enabled. (Firefox bug 1329241).

JavaScript

  • The collation property can now be specified in the options passed to the Intl.Collator() constructor (Firefox bug 1670062). This allows developers to write code with greater clarity:

    js
    // Old method
let pinyin = new Intl.Collator(["zh-u-co-pinyin"]);
// New method
let pinyin = new Intl.Collator("zh", { collation: "pinyin" });

Plugins

APIs

No changes.

WebDriver conformance (Marionette)

  • Fixed a potential page load timeout situation when WebDriver:ElementClick is called for a link with a target other than _blank (Firefox bug 1678455).
  • Using web element references on browsing contexts other than the originating one now correctly returns a no such element error instead of a stale element reference error (Firefox bug 1684827).

Known bugs

  • WebDriver commands following a call to WebDriver:SwitchToFrame can fail with a "no such window" error if the frame's content hasn't yet finished loading (Firefox bug 1691348).
  • After a cross-group page navigation, accessing a previously-retrieved element might not always raise a "stale element" error, and can also lead to a "no such element" error. To prevent this, set the marionette.actors.enabled preference to false (Firefox bug 1690308).

Changes for add-on developers

No changes.