"I'm extremely pleased to announce the launch of TraceMonkey, an evolution of Firefox's SpiderMonkey JavaScript engine for Firefox 3.1 that uses a new kind of Just-In-Time (JIT) compiler to boost JS performance by an order of magnitude or more..."

"For the last two months I have been working with Mozilla on a just-in-time compiler for the JavaScript engine in Firefox, and a few hours ago this project (codenamed TraceMonkey) has landed in the main Firefox development tree. TraceMonkey is a trace-based JIT compiler and it pushes the envelope on JavaScript performance..."

Mozilla's high-performance TraceMonkey JavaScript engine, which was first introduced in 2008, has lost a lot of its luster as competing browser vendors have stepped up their game to deliver superior performance. Firefox now lags behind Safari, Chrome, and Opera in common JavaScript benchmarks.

Firefox 4 is the fastest Firefox yet. With dramatic speed and performance advancements across the board, Firefox is between two and six times faster than previous releases. Major enhancements to the JavaScript engine make everything from startup time to page load speed to graphics and JavaScript performance screaming fast in Firefox.

We posted yesterday about Firefox having very different JavaScript performance on Windows and Linux, despite being the same version of the software... we thought we would conduct a couple more quick benchmarks to see whether we can eliminate some of these variants.

Some Mozilla Corp. developers have recommended that the company consider yanking the new JavaScript engine, dubbed TraceMonkey, from Firefox 3.1 to get the browser back on track and out the door.

As announced, Mozilla has released the first update for Firefox 3.5, prompted by the disclosure of a critical security flaw related to TraceMonkey, the new JavaScript optimizer, earlier this week.

Mozilla's JaegerMonkey is designed to bring the web browser's JavaScript performance up to par with that of its competitors

Firefox 3.6 was released yesterday, after over six months since the last major release, version 3.5.