November 7, 2006. Adobe gifts 135,000 lines of code to Mozilla in the form of Project Tamarin, a Javascript Virtual Machine compliant with the still-not-fully-implemented ECMAScript 4. Mozilla would try a few times to incorporate Tamarin into Firefox, but would eventually abandon that idea for performance reasons.

Still, it injected some enthusiasm into adopting more modern Javascript standards, pushing the web forward at a time when it really needed that.