I started by trying it out on Firefox (nightly), but after a few minutes, my laptop's fan started ramping up as the CPU usage climbed and then the sound became

I started by trying it out on Firefox (nightly), but after a few minutes, my laptop's fan started ramping up as the CPU usage climbed and then the sound became all distorted until it was unplayable. :/ I was playing the first Rachmaninov piece when it happened.