Firefox for Android
Release Notes

New Tablet user interface

Support for the full HTTP/2 protocol. HTTP/2 enables a faster, more scalable, and more responsive web.

Locale added: Maithili (mai) (Android Lollipop only)

Various security fixes

CSS gradients work on premultiplied colors

DNS resolution when using VPNs or switching networks

Fix some unexpected logout from Facebook or Google after restart

No longer accept insecure RC4 ciphers whenever possible

Phasing out Certificates with 1024-bit RSA Keys

Add-on Compatibility

Support for the ECMAScript 6 Symbol data type added

unicode-range CSS descriptor implemented

object-fit and object-position implemented.
Defines how and where the content of a replaced element is displayed

isolation CSS property implemented.
Create a new stacking context to isolate groups of boxes to control which blend together

CSS3 will-change property implemented.
Hints the browser of elements that will be modified. The browser will
perform some performance optimization for these

Improved ES6 generators for better performance

Changed JavaScript 'const' semantics to conform better to the ES6 specification.
The const declaration is now block-scoped and requires an initializer. It also can not be redeclared anymore.

January Chromecast firmware update broke tab mirroring (1131084)

On Android 2.3, 3.0 and 4.0, some WebM videos cannot be read properly (1131563)

Style Editor: Extra white space appearing above the editor for a sourcemapped scss file (1128747)