Firefox 94 release notes for developers

Changes for web developers

HTML

No notable changes

CSS

No notable changes

JavaScript

No notable changes

APIs

• The Window.structuredClone() and WorkerGlobalScope.structuredClone() function is now supported for copying complex JavaScript objects (Firefox bug 1722576).

DOM

• Developers can now provide a hint for the enter key label/icon used on virtual keyboards, using either HTMLElement.enterkeyhint or the global attribute enterkeyhint (Firefox bug 1648332).
• The HTMLScriptElement.supports() static method is now supported. This provides a simple and unified method for feature checking whether a browser supports particular types of scripts, such as JavaScript modules or classic scripts (Firefox bug 1729239).
• The ShadowRoot.delegatesFocus property is now supported, allowing code to check whether the delegatesFocus property was set when the shadow DOM was attached (Firefox bug 1413836).

WebDriver conformance (Marionette)

• WebDriver:GetWindowHandle and WebDriver:GetWindowHandles now return handles for browser windows instead of tabs, when chrome scope is enabled (Firefox bug 1729291)

HTTP

• The cache directive of the Clear-Site-Data response header has been disabled by default. It can be enabled using the preference privacy.clearsitedata.cache.enabled (Firefox bug 1729291).

Changes for add-on developers

• Support for partitionKey, the first-party URL of a cookie when it's in storage that is partitioned by top-level site, is added to cookies.get, cookies.getAll, cookies.set, cookies.remove, and cookies.cookie. (Firefox bug 1669716)
• When a context menu is activated, menus.OnClickData.srcUrl returns the raw value of the src attribute of the clicked element, instead of the current URL (after redirects). (Firefox bug 1659155)