How can I remove s.yimg.com from my windows PC? Please help

My PC is a Windows 10 system and I am using Firefox. I started noticing that when ever I do anything with the browser it takes forever to respone while it is waiting for s.yimg.com. I ran full system scans which didn’t detect anything. I ran CCleaner and Spybot and nothing fixes it. Whatever information is needed, please let me know and I will provide.

Thanks for any help.

Start a topic in V&W and post your logs there: https://forum.avast.com/index.php?action=post;board=4
Instructions (basic diagnostic logs): https://forum.avast.com/index.php?topic=194892.0

Well, s.yimg.com is a CDN owned by & registered to Yahoo. It is often used to deliver ads to your browser.