Chrome is simply an amazing piece of software. We have a fairly large Javascript app and Chrome seems to be running circles around Firefox and Edge. Safari used

Chrome is simply an amazing piece of software. We have a fairly large Javascript app and Chrome seems to be running circles around Firefox and Edge. Safari used to suck, but they caught up recently. So yes, if Firefox wants to stay in the game, for us performance is the key. They made great progress (for example flexbox layout has seen huge improvements recently), but there is still a long way to go.