10 RC is up. This is the first release of what will be the stable branch (based on Mozilla ESR); development on the current version of Firefox continues as the unstable branch -- see the blog for more: http://tenfourfox.blogspot.com/2012/01/two-forks-diverged-in-wood-and-i-i-took.html Development on the JITs, however, will still land on both branches.