Q: How to stop ads from playing on my mac when I'm on safari.

It's malware but easy to remove ..

Download and run the adware removal tool here >   The Safe Mac » Adware Removal Guide

Safe and only takes a minute or two.

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Start a reply to this message. Drag the image file into the editing window to upload it. You can also include text in the reply.

I mean the window on this web page in which you type replies.