Tried accessing 10centuries on the 12-inch PowerBook. No response from Safari or Stainless apps. All perfectly fine with TenFourFox.
Why? Because the other two are not being updated & haven't been for about five years. TFF, on the other hand is in active development.
It's a painfully slow experience using Safari or TenFourFox to get the updates of TenFourFox from Sourceforge. That's where Stainless (a fork of Chrome for PPC & Intel Macs) come into its own. It's exceptionally fast & responsive. Against that, the interface is just plain horrid.
Did I mention fast? Cos it really is.
There are documented cases of people getting Stainless to run on Mavericks OS.