It is a lot of work. WebKit didn't want it in their code base, but blink is experimenting with it with oilpan[0]. It would also take a lot of work in Firefox to

It is a lot of work. WebKit didn't want it in their code base, but blink is experimenting with it with oilpan[0]. It would also take a lot of work in Firefox to do. The big issue is having both runtimes executing in the same DOM. handling garbage collection becomes a lot more complicated. [0] http://www.chromium.org/blink/blink-gc http://www.chromium.org/blink/blink-gc