FYI: Earlier, I ran CSS Lint on Necolas' normalize.css, and CSS Lint warned (among a few other things) "The property -moz-appearance is compatible with -webkit-appearance and should be included as well."
To which Necolas' very prompt response over there was: "The -moz version isn't needed for anything. CSS Lint's warning is not relevant because it doesn't understand the context."
Honestly, I don't quite get that. But, I thought I'd mention it here in hopes it offers a clue towards a future improvement.
Thanks to all!