[kup0]

Glad it's not just me. All of those really seem to stress Firefox out on my iMac. Chrome is far more efficient with something like Twitch.

Interesting thing I've noticed: If you don't use chat much and just want the video, try using Twitch's "pop-out" player that opens in its own window- for me this uses far less CPU (even in Chrome)

Chrome's "switch to fullscreen" transition on twitch for me is super laggy though, and I haven't been able to solve that one (Firefox switches to fullscreen smoothly).