How to Automatically Mute New Tabs in Chrome and Firefox

Let’s say you’re trying to be quiet, browsing the internet at home, work, or a public space. You’re secretly filled with dread that anything you click will open a new tab with an autoplay video or blare an obnoxious audio ad. End that fear forever by keeping all your new tabs muted by default.
by Eric Z Goodnight via How-To Geek