Firefox 3.5 is the fastest and most advanced Firefox ever.
Tuesday, December 8, 2009 by ashwin
Faster JavaScript
The TraceMonkey JavaScript engine brings screaming fast performance to Firefox 3.5. With JavaScript that's more than twice as fast as Firefox 3 and 10x faster than Firefox 2, you’ll be able to see the difference without breaking out your stopwatch.
Faster DOM
We’ve been working hard to make DOM access and manipulation faster in Firefox 3.5- over 2x faster than Firefox 3, in fact. We’ve removed overhead from our code, added new fast-access query and manipulation methods, and added support for new standards.
Firefox 3 -244.12
Firefox 3.5 - 458.03
* Number of runs of Dromaeo JavaScript performance test completed