Firefox 3.5 introduced TraceMonkey, our new JavaScript engine that traces loops and JIT compiles them to native (x86/ARM) code. Many JavaScript programs ran 3-4x faster in TraceMonkey compared to Firefox 3. (See our previous article for technical details.)
For JavaScript performance in Firefox 3.6, we focused on the areas that we thought needed further improvement the most:
JavaScript speedups in Firefox 3.6
hacks.mozilla.org —
JavaScript speedups in Firefox 3.6 ✩ Mozilla Hacks – the Web developer blog
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