I know that the release notes still says Firefox Beta when I submit this, but my browser just updated itself to version 23. The beta release notes usually are pretty accurate when it comes which features will be in the next stable version.
I believe the new baseline compiler is included in this release as described here:
I believe the new baseline compiler is included in this release as described here:
https://blog.mozilla.org/javascript/2013/04/05/the-baseline-...
If that is the case it's the most interesting new feature for me, but I'm a compiler guy :-)