Perfect. I thought that's what I remembered reading but couldn't even come close to finding it when I wrote that. That's the kind of research they've been intending to do with it for a while now and it's honestly huge enough that I won't be too surprised if Servo starts replacing Gecko on Firefox OS and the Firefox Mobile browsers. All it's going to take is to really get it working on 90% of websites and then I think it'll be a clear contender for replacing Gecko in a lot of places. I'd love to also see a JS engine in Rust but I know with a JIT and all you end up with none of the safety you get from Rust anyway. With the browser chrome being done in HTML with the mozbrowser extensions it looks like it might be possible to start doing a lot of the same things that XUL does in firefox which opens the door to a lot of stuff being ported to the new browser.