Implement Worker Modules

Can't wait to see vdom frameworks switch to their own thread Such as https://github.com/neomjs/neo

Chromium supports it so the web will move forward, with or without Firefox.

Modules are the piece of js that never ever happen.

to be more clear: this ticket got created 4 years ago.

In case you care about Firefox not falling behind completely, please add some weight here.

Thanks & happy holidays! Tobias