Credit:
If you're already jumping on the "Apple is evil" bandwagon, don't. Or rather make it "Apple is sloppy." Vladimir himself says that Slashdot has misunderstood his post. In his words:
"To be clear, I do not think that Apple is in any way trying to purposely "cripple" non-Apple software. I also do not think that undocumented APIs give Safari any kind of "significant performance advantage" (as Firefox 3 should show!). However, as I said, the undocumented functionality could be useful for Firefox and other apps to implement things in an simpler (and potentially more efficient) manner. I don't think this is malicious, it's just an unfortunate cutting of corners that is way too easy for a company that's not fully open to do."