If this really takes off (it's now only in it's early stages and still is only 2x slower than C/C++!) then we could really see the YOTLD for real (+Steam gaining more GNU/Linux games). Also now with Android more devs are ditching DirectX and Windows specific engines. The C/C++ -> JScript seems like a quite amazing hack, hope it isn't as riddled with potential exploitation's as i fear. Great work Mozilla!