Putting hosts (and domains) under control of &#x2F;etc&#x2F;hosts and dnsmasq means that there&#x27;s little likelihood of traffic reaching them from your browser (though Web hosts could provide back-end data transfers).<p>It&#x27;s also possible to directly address hosts by IP, though unlikely (Web protocols such as virtualhosts would fail).<p>I&#x27;m strongly favouring uMatrix for now. It takes some tuning, but you have fine-grained control over CSS, images, scripts, XHR, frames, and other bits, by domain or host.<p>Aggregators and CDNs confound things a bit (Akamai, Amazon&#x27;s cloudy thing.)