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The new version provides a significant boost in running JavaScript and displaying graphics, Mozilla said. In addition, the add-on application programming interfaces for Firefox 4 are now stable, which means developers can start updating Firefox 3.6-compatible add-ons to support the upgrade.
The JagerMonkey JIT compiler has been added to the Firefox SpiderMonkey JavaScript engine, which also includes enhancements to the existing TraceMonkey JIT and SpiderMonkey’s interpreter. The improvements bring a faster startup time and better performance to Web apps and games, Mozilla says. Benchmark tests show the browser runs JavaScript from three to five times faster than Firefox 3.6.