Bad news for Safari users: no one know yet how long it will take before Safari (default browser in Mac) will support the editors used in Wordpress. As a Safari user myself, it find it better than Firefox, faster and easier to use too.
Unfortunately, this is all I get with the Visual Rich Editor turned on:

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Has anyone tried the latest beta of the webkit? I mainly use Firefox, so I haven’t.
You can get the webkit here:
http://webkit.org/
I was working on a project at Apple that required Safari’s Java support to be enhanced. The latest version of Safari didn’t work, but the latest webkit beta did. It I were trying to get some Java stuff to work in Safari, I would try thte webkit.