In Firefox, about:config and then set media.autoplay.enabled to false.

I use uMatrix and uBlock Origin and didn't get auto-play...

As an alternative, try the AutoMute plugin for Chrome.

I like using HTML5 content blocker. Works for reducing bandwidth (blocking images, objects and media) or for this type of b/s.

Don't use pulseaudio and all the loud stuff goes away. It's one of the new features in Firefox.

Noscript.