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

33.0.1: Firefox displays a black screen at start-up with certain graphics drivers

Various security fixes

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

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

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

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