See what’s new in Firefox!

Pinned tiles on the new tab page can be synced

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

Locale added: Uzbek (uz)

Fix some unexpected logout from Facebook or Google after restart

Various security fixes

CSS gradients work on premultiplied colors

Shut down hangs will now show the crash reporter before exiting the program

Phasing out Certificates with 1024-bit RSA Keys

No longer accept insecure RC4 ciphers whenever possible

-remote option removed

Add-on Compatibility

Inspector: More paste options in markup view

DOM Promises inspection

Eval sources now appear in the Debugger
Debug JavaScript code that is evaluated dynamically, either as a string passed to eval() or as a string passed to the Function constructor

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.

Improved ES6 generators for better performance

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

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

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

CSSOM-View scroll behavior implemented allowing smooth scrolling of content without custom libraries

unicode-range CSS descriptor implemented

Support for the ECMAScript 6 Symbol data type added

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

For users who removed the Share & Hello buttons, this new version brings them back unexpectedly (1136300)

Firefox Hello does not work for link generators if there is no camera installed (1106941)