Mac won't open sites after installing avast

Sorry if it's wrong place to ask a question like this. I installed Avast to fix a malware, and then all websites barring few (basically Google) won't open. I've uninstalled avast but the problem persists.

I've checked Firewall, reset permissions using Onyx but the issue persists.

I can open all sites in safe mode. And I've removed all files of Avast. Still the problem persists. My login items doesn't list any other program.

Please help. I have the latest mac OS installed.

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