Why am I getting access denied on a website?

The “Access Denied” error appears when your Mozilla Firefox browser uses a different proxy settings or VPN instead of what’s really set on your Windows 10 PC. Thus, when a website detected that there is something wrong with your browser cookies or your network, it blocks you which is why you can’t open it.

For More Information Please Refer: https://errortools.com/windows/how-to-fix-access-denied-you-dont-have-permission-to-access-on-this-server-error-in-windows-10/