Safari 4 (dev. preview) vs Firefox 3.0rc3
Running JavaScript performance test at http://webkit.org/perf/sunspider-0.9/sunspider.html
Stats: 2GHz G5 iMac, 1GB RAM, MacOS X 10.5.3
Running only the browser and TextEdit during the test.
Safari 4 developer preview:
Total: 5312.0ms +/- 1.9%
Firefox 3.0rc3:
Total: 6902.6ms +/- 3.0%