Maybe irrelevant today, but maybe not irrelevant tomorrow. JavaScript is what the web "runs on", and if Firefox might in the future provide the fastest way to

Maybe irrelevant today, but maybe not irrelevant tomorrow. JavaScript is what the web "runs on", and if Firefox might in the future provide the fastest way to run JavaScript. Obviously for most cases that isn't going to be that relevant, but I can imagine a situation where you have Photoshop-in-the-browser and it runs better on Firefox due asm.js.