If you have philosophical objections over H.264 because of patents etc., then this won't help. If you have the HTML player enabled, and if your GPU supports ha

If you have philosophical objections over H.264 because of patents etc., then this won't help. If you have the HTML player enabled, and if your GPU supports hardware H.264 decoding (most do these days), this plugin may help: https://github.com/erkserkserks/h264ify https://github.com/erkserkserks/h264ify Otherwise Youtube might send VP8, which your CPU has to decode.