Avast search/antivirus

Ever since I downloaded Avast (which I no longer use), It seems to use avast to tell me if a website is not available as an error handler.

https://search.yahoo.com/yhs/errorhandler?hspart=avast&hsimp=yhse-ak&q=thundermeadgames.com

When I try to go to thundermeadgames.com it comes up saying that “Oops! Page Not found. Sorry the page you are looking for cannot be found. To learn more click here.”

I know its a legit site. It only does it on my Firefox browser. I have checked for apps that it uses and also search is set to use google.

Please help

Follow instructions: https://www.avast.com/uninstall-utility (Run this tool for all prior installed Avast versions…!!)