Do Web sites that auto-play videos or ads drive you mad? They do me. Especially when I reopen Safari and several of tabs that I had open earlier open back up and the ads or videos start playing again. Since OS X 10.11 El Capitan, Safari can put an end to this on your Mac. If you have multiple tabs open, whenever audio is playing in a tab, an audio icon appears next to the name of the tab and at the right of Safari’s Smart Search field. To mute the audio in a tab with this audio icon, just click on the audio icon. If you’ve ended up with multiple tabs playing, you can mute all those except the current tab by Option-clicking either of those audio icons. And, finally, click and hold the audio icon in the Smart Search field for a menu with Mute and Unmute commands, and a list of all tabs that contain audio. I hope the tip helps!