While tracking down an issue (ha!) with firefox 4 and PPC machines, I found this:
Unfortunately, PPC Tiger does not support OpenGL 2 at al (the really irritating part is that Intel Tiger does have OpenGL 2, and OpenGL 2 came out in 2004!).
Does SK have anything in it that wants OGL 2? Might this be why a G4 mac is so much worse than a microsoft windows system?
EDIT: REAL ICCKY:
Mozilla requires non-power-of-two texture sizes, which require OpenGL 2.
Does this mean that a 1024x512 display would have hardware acceleration, while anything else would not?