http://firefox.comUse Firefox. There are too many bugs in Apples web browser. If we spent the time we could probably fix them all with workarounds. However then as they fixed things that would probably break our workarounds. It would be a constant mess.
Also because Internet Explorer and Firefox combined are about 93%+ of the browser population we get the most bang for the buck doing all our testing in those 2 browers. The last time I checked Safari was around 5%.