You may have heard of Project Quantum… it’s a major rewrite of Firefox’s internals to make Firefox fast. We’re swapping in parts from our experimental browser, Servo, and making massive improvements to other parts of the engine.
The project has been compared to replacing a jet engine while the jet is still in flight. We’re making the changes in place, component by component, so that you can see the effects in Firefox as soon as each component is ready.
And the first major component from Servo—a new CSS engine called Quantum CSS (previously known as Stylo)—is now available for testing in our Nightly version. You can make sure that it’s turned on for you by going to
... read the whole story at hacks.mozilla.org.