Embedded references to external javascript libraries, fonts, images, and so on on a web page are resolved by the browser by making a connection to the service t

Embedded references to external javascript libraries, fonts, images, and so on on a web page are resolved by the browser by making a connection to the service that hosts the resource, and connections over the Internet necessarily involve two IP addresses of some sort, the IP address of the requester (or a requester) and the IP address of the responder. Every web browser works that way by default. There are two basic choices to avoid that - in some cases you can just host the resources yourself so the client browser does not connect to hosts operated by others, or you can operate a proxy so that the client browsers requests are relayed and anonymized before going to a third party.