Firefox 89 for developers

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This article provides information about the changes in Firefox 89 that will affect developers. Firefox 89 is the current Nightly version of Firefox, and will ship on May 18, 2021.

Changes for web developers

Developer Tools

Removals

HTML

Removals

CSS

Removals

JavaScript

Removals

HTTP

Removals

Security

Removals

APIs

DOM

Media, WebRTC, and Web Audio

Removals

WebAssembly

Removals

WebDriver conformance (Marionette)

Removals

Changes for add-on developers

Removals

Older versions