I'm pleased to hear that - my perception has been that Mozilla has been moving in a more isolated, NiH-ish direction of late (not just dart but e.g. h264 support in <video&rt;). Does this mean there's a chance of PNaCl support being added to firefox if it shows itself to be effective in practice?
Dart and PNaCl have been rejected by not only Mozilla but also upstream WebKit (Apple) and Microsoft. In other words, Google is the only proponent of these technologies. I have no idea how you could paint that as "isolated" or "NIH".