Firefox 100 for developers

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This article provides information about the changes in Firefox 100 that will affect developers. Firefox 100 is the current Nightly version of Firefox and will ship on May 3, 2022.

Changes for web developers

Developer Tools

HTML

Removals

CSS

Removals

JavaScript

Removals

HTTP

Removals

The non-standard Large-Allocation HTTP header has been removed (bug 1598759).

Security

Removals

APIs

WritableStream, WritableStreamDefaultWriter, WritableStreamDefaultController, and ReadableStream.pipeTo() are now supported (bug 1759597).

DOM

Media, WebRTC, and Web Audio

Removals

WebAssembly

Removals

WebDriver conformance (Marionette)

Removals

Changes for add-on developers

Removals

Other

Older versions