How set the default audio to be on for tutorials?

The AWS video tutorial set has very short videos. With each new video, I have to go back and manual turn the audio on. Is there a setting where I can just have the video start with the audio on?

It’s triply annoying because getting to the setting requires scrolling, and by the time it is done, I then have to also move the video back to the beginning. I was okay for the first few, but after a dozen it is getting pretty old. Am using Firefox, if that makes a difference.