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install Firefox Developer Edition
Firefox 47 was released on June 6, 2016. This article lists key changes that are useful not only for web developers, but also Firefox and Gecko developers as well as add-on developers.

Changes for Web developers

Developer Tools

HTML

No change.

CSS

JavaScript

Interfaces/APIs/DOM

DOM & HTML DOM

WebGL

No change.

IndexedDB

WebRTC

  • Support for the RTCIceServer dictionary has been updated in keeping with revisions to the WebGL 1.0 specification by adding support for the credentialType property. This property is a string which specifies whether the credential is a password or a token. Currently, Firefox only supports "password".

New APIs

No change.

Others

Audio/Video

HTTP

  • The default value of the Accept header for images is now */* instead of image/png,image/*;q=0.8,*/*;q=0.5 (bug 1249474).

Networking

No change.

Security

Changes for add-on and Mozilla developers

Interfaces

  • The CSS tokenizer is now available in JavaScript for add-ons (bug 1152033).

FUEL

The FUEL JavaScript library, introduced back in Firefox 3, has been removed. This library was designed to aid in add-on development and with the introduction of the Add-on SDK and, now, by WebExtensions support, is no longer useful. (bug 1090880)

XUL

No change.

JavaScript code modules

No change.

XPCOM

No change.

Other

No change.

See also

Older versions

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