Browsers can also prefetch pages under some circumstances (I'm not sure of the details). In that case, the web server for sketchy-service.com now has your exac

Browsers can also prefetch pages under some circumstances (I'm not sure of the details). In that case, the web server for sketchy-service.com now has your exact IP address (vs. the truncated address encouraged by this extension). In firefox this can be prevented with: network.dns.disablePrefetch True network.prefetch-next False