NEW: Windows: Firefox now follows display scaling options to render text larger on high-res displays.
NEW: WebRTC is now enabled by default!
NEW: Mac OS X: Download progress in Dock application icon.
NEW: HTML5 audio/video playback rate can now be
changed.
NEW: Social services management implemented in Add-ons Manager
NEW: asm.js optimizations (OdinMonkey) enabled for major performance improvements
CHANGED Improved WebGL rendering performance through asynchronous canvas updates.
CHANGED Plain text files displayed within Firefox will
now word-wrap.
CHANGED: For user security, the |Components| object is no longer accessible from web content
CHANGED Improved memory usage and display time when rendering many images.
CHANGED Pointer Lock API can now be used outside of
fullscreen.
HTML5 New HTML5 <data> and <time> elements.
DEVELOPER New Web Notifications API implemented.
DEVELOPER New built-in font inspector.
DEVELOPER Added clipboardData API for JavaScript
access to a user's clipboard.
DEVELOPER CSS3 Flexbox implemented and enabled by
default.
FIXED: Scrolling using some high-resolution-scroll aware touchpads feels slow</time></data>
download:
https://download.mozilla.org/?product=firefox-22.0&os=win&lang=en-US