See what’s new in Firefox!

New

• 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

Fixed

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

• Various security fixes

Changed

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

• Proprietary window.crypto properties/functions removed

Developer

• 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

HTML5

• DOMMatrix interface implemented

• @counter-style rule from CSS3 Counter Styles specification implemented

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

unresolved

• 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)