The second beta release in the new Firefox 24.x branch has been made available for download by Mozilla, for all available platforms.
The binaries for Mozilla Firefox 24 Beta 2 can be downloaded and run without having to install anything.
The latest Beta version of Firefox comes with a few new features, like the ability to close tabs to the right, major SVG rendering improvements around Image tiling, improved and unified Browser console, and much more.
A detailed list of upcoming features and other various changes can be found on the official website.
Download Mozilla Firefox 24 Beta 2 for Windows
Download Mozilla Firefox 24 Beta 2 for Linux
Download Mozilla Firefox 24 Beta 2 for Mac OS X
Remember that this is a development version and it should NOT be installed on production machines. It is intended for testing purposes only.