It was for me, on every OS I ever ran it. I say that as a dedicated Firefox user. Right now, today, Firefox is generally responsive for me but not faster to r

It was for me, on every OS I ever ran it. I say that as a dedicated Firefox user. Right now, today, Firefox is generally responsive for me but not faster to render or process than Chrome for most workloads. I still see plenty of jank when framerates matter like when scrolling a busy page. That said, when pages leverage Firefox's special performance features, like ASM.js, I've seen it vastly outperform Chrome, many times faster.