Firefox

Firefox 58 for developers

This article provides information about the changes in Firefox 58 that will affect developers. Firefox 58 is the current Nightly version of Firefox, and will ship on January 16, 2018.

Changes for Web developers

Developer Tools

HTML

No changes.

CSS

SVG

No changes.

JavaScript

APIs

New APIs

DOM

DOM events

No changes.

Media and WebRTC

Canvas and WebGL

No changes.

HTTP

Security

No changes.

Plugins

No changes.

Other

No changes.

Removals from the web platform

HTML

  • You can no longer nest an <a> element inside a <map> element to create a hotspot region — an <area> element needs to be used instead (bug 1317937).

CSS

JavaScript

APIs

SVG

No changes.

Changes for add-on and Mozilla developers

WebExtensions

No changes.

See also

Older versions

Document Tags and Contributors

 Contributors to this page: chrisdavidmills, fscholz, Sheppy
 Last updated by: chrisdavidmills,