I often find sites with subpar performance in Firefox. I think that it's the sites' fault though, for testing only in Chrome / Safari. Reddit's redesign is an e

I often find sites with subpar performance in Firefox. I think that it's the sites' fault though, for testing only in Chrome / Safari. Reddit's redesign is an example, the loading, scrolling, post opening experience is slow and I can see that it eats a lot of CPU. In chrome it's much faster on the same machine.