Firefox 48 for developers

To test the latest developer features of Firefox, install Firefox Developer Edition Firefox 48 was released on August 2, 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

CSS

JavaScript

New APIs

Deprecations and removals

Interfaces/APIs/DOM

DOM & HTML DOM

Canvas 2D

WebRTC

Others

HTTP

Changes for add-on and Mozilla developers

Older versions