The beta is released, for those that like to test, and those don't mind if their browser crashes.
Three new options include, Support for new scrollbar style in Mac OS X 10.7 and newer, close tabs to the right, and on the social side, the ability to tear-off chat windows to view separately by simply dragging them out.
For developers, the browser console is improved for better debugging.
Firefox 24 (Beta) [mozilla.org
Release notes [mozilla.org