Wait... I just downloaded 57beta, and loaded CNN and USAToday, two sites with terrible video autoplay. Immediately upon loaded CNN, my fan starts spinning up l

Wait... I just downloaded 57beta, and loaded CNN and USAToday, two sites with terrible video autoplay. Immediately upon loaded CNN, my fan starts spinning up loudly (2016 macbook pro). When I loaded USAToday in another tab, I had to just quit FF because CPU was maxed out and laptop was overheating. So...?