"Firefox 18.104.22.168 and Intel Mac you get the Tech Specs but they do not appear on Safari 2.0.4
Likely as not, it's a CSS standard or something else that Webkit (the rendering engine that Safari is built on) does not support yet. That or... Apple really hasn't updated the version of Webkit that they use in a while. If you use Shirra or Sunrise (both Profiled in MarMerc's Freeloader Friday Specialized Browsers), you can choose to use them with the Webkit nightly build which likely works. (Note, I *think* it's possible to update Safari to the new webkit, but that's a little beyond my ken)
dislaimer: I've not actually had an opportunity to use either of the browsers yet as my work computer is a M$ machine and I don't get on my home computer much (I LOVE macs) as when I get home at night about all I want to do is play with my son and talk with my wife.