After falling behind Apple’s Safari, Google’s Chrome, and Opera in the browser Javascript rendering wars, Mozilla is working on a new version of Firefox with a new Javascript engine. Ryan Paul in Ars:

The secret sauce that will drive Mozilla’s new JavaScript engine engine into the fast lane is some code borrowed from Apple’s WebKit project. Mozilla intends to bring together the powerful optimization techniques of TraceMonkey and the extremely efficient native code generator of Apple’s JSCore engine. The mashup will likely deliver a significant boost in Firefox’s JavaScript execution speed, making Mozilla’s browser a formidable contender in the ongoing JavaScript speed race.

If you can’t beat ‘em, join ‘em.