Wow, right up front, they’re being disingenuous:
“The effect of this would be to force an independent browser like Firefox to build and maintain two separate browser implementations — a burden Apple themselves will not have to bear.”
…No? Apple won’t bear that burden because they’re going to keep using WebKit. Firefox can keep using WebKit. Not using WebKit is a choice, with pros and cons.
It also has a 1v1 mode (player vs computer or PvP) that is just fantastic. I actually spent most of my time playing the 1v1 mode way back in the day.