NEW - Per-window Private Browsing
NEW - New download experience
NEW - Ability to close hanging plugins, without the browser hanging
NEW - Firefox will offer to reset the Awesomebar search provider, if
it has been changed by third-party software or through about:config
CHANGED - Continued performance improvements around common browser tasks (page loads, downloads, shutdown, etc.)
DEVELOPER - Continued implementation of draft ECMAScript 6 - clear() and Math.imul
DEVELOPER - New JavaScript Profiler tool
HTML5 - <canvas> now supports blend modes
HTML5 - Various <audio> and <video> improvements
HTML5 - getUserMedia implemented for web access to the user's camera and microphone (with user permission)
FIXED - Details button on Crash Reporter (793972)
FIXED - Unity plugin doesn't display in HiDPI mode (829284)</video></audio></canvas>