Hm, could somebody explain the multi-threaded part to me? I'm a little confused. I didn't think multiple threads were possible in js. Furthermore, does this only work on Firefox?
They are available in most major browser (including recent IE).
[1]: https://developer.mozilla.org/en/docs/Web/Guide/Performance/...
Web workers are quite useful and I'm sure there are a fair number of webapps that take advantage of them.
[1]: http://brackets.io/