Firefox 61 for developers

This article provides information about the changes in Firefox 61 that will affect developers. Firefox 61 was released on June 26, 2018.

Changes for web developers

Developer tools

HTML

No changes.

CSS

SVG

JavaScript

APIs

New APIs

DOM

DOM events

No changes.

Service workers

The "Forget" button, available in Firefox's customization options, now clears service workers and their caches (Firefox bug 1252998).

Web Audio, Media and WebRTC

  • The AudioContext() constructor now accepts an optional options parameter. This lets you configure the preferred latency and/or sample rate for the new context.
  • Firefox now throws the correct exceptions when instantiation of an AudioBuffer fails.

WebVR

Canvas and WebGL

No changes.

CSSOM

HTTP

Networking

  • Firefox 61 and later no longer support using the FTP protocol (that is, URLs with the "ftp://" scheme) to load subresources from within HTML content. FTP is still supported as a top-level URL entered directly into the URL bar or loaded as a standalone document (Firefox bug 1404744).

Security

No changes.

Plugins

No changes.

Other

No changes.

Removals from the web platform

Developer tools

Cmd/Ctrl + Shift + O no longer shows/hides the DevTools options panel — use F1 instead (Firefox bug 1409456).

HTML

No changes.

CSS

@-moz-document has been disabled in content pages (Firefox bug 1422245).

APIs

SVG

Other

No changes.

Changes for add-on and Mozilla developers

WebExtensions

Older versions