Macrodobe and Mozilla - two great tastes that taste great together

Macrodobe and Mozilla.org have joined forces to create an Ecmascript virtual machine called Tamarin.

From the site:
The goal of the "Tamarin" project is to implement a high-performance, open source implementation of the ECMAScript 4th edition (ES4) language specification. The Tamarin virtual machine will be used by Mozilla within SpiderMonkey, the core JavaScript engine embedded in Firefox®, and other products based on Mozilla technology. The code will continue to be used by Adobe as part of the ActionScript(tm) Virtual Machine within Adobe® Flash® Player.