Mozilla has the ESR branch marked with DONTBUILD for some reason, so the ESR RC for 10.0.3 will not be out until this weekend along with a temporary patch for issue 134, which appears to be a bug in our software square root. In the interest of stability and not duplicating effort, we'll leave it off on the stable builds and try to get it fixed in unstable.
Speaking of unstable, this post is coming from TenFourFox 11 ("but ours goes to eleven"). I lied, I decided to do a beta for it after all. You'll get that soon.