Firefox Release Notes

OpenH264 support (sandboxed)

Improved search experience through the location bar

Windows: OMTC enabled by default

Slimmer and faster JavaScript strings

Search suggestions on the Firefox Start (about:home) and new tab (about:newtab) pages

Support for connecting to HTTP proxy over HTTPS

New CSP (Content Security Policy) backend

Improved reliability of the session restoration

Azerbaijani [az] locale added

Various security fixes

Fix incomplete downloads being marked as complete by detecting broken HTTP1.1 transfers (237623)

JSD (JavaScript Debugger Service) removed in favor of the Debugger interface

Proprietary window.crypto properties/functions removed

Cubic-bezier curves editor

Paint flashing for browser content repaints

Display which elements have listeners attached

New sidebar which displays a list of shortcuts to every @media rule in the current stylesheet

Editable @keyframes rules in the Rules section of the Inspector

CSS transform highlighter in the style-inspector

DOMMatrix interface implemented

@counter-style rule from CSS3 Counter Styles specification implemented

PDF.js: With some images, wrong colors could show up. Affects a very small number of PDF

Some certificate errors cannot be overridden (1042889)

Windows: On some combination of hardware and drivers, the main window could be black. In this case, update your graphics drivers (1083071)

Windows: With Avast HTTPS scanning enabled, Firefox will not close correctly (1087674)

Windows: Interface may be slow when typing or selecting text (1089183)