Firefox 88 for developers

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This article provides information about the changes in Firefox 88 that will affect developers. Firefox 88 is the current Beta version of Firefox, and will ship on April 20, 2021.

Changes for web developers

Developer Tools

Removals

HTML

Removals

CSS

Removals

JavaScript

Removals

HTTP

Removals

Security

Removals

APIs

DOM

  • Code can now use the new static method AbortSignal.abort() to return an AbortSignal that is already set as aborted. This is useful when the signal is requested/created after the associated operation has already been aborted. For more information see bug 1698468.

Media, WebRTC, and Web Audio

Removals

WebAssembly

Removals

WebDriver conformance (Marionette)

Removals

Changes for add-on developers

Removals

Older versions