Whether cops are going undercover to learn more about suspects , or deploying hacking tools to unmask them on a mass scale , each side is always trying to stay one step ahead of the other . Apparently in response to law enforcement 's use of malware , one dark web child pornography site recently started redirecting visitors to a page with additional security advice if their browser runs JavaScript . `` At [ child pornography site ] we have always had a big JavaScript warning Vulnerability-related.DiscoverVulnerability if you have it enabled , '' one user on a dark web child abuse site wrote Vulnerability-related.DiscoverVulnerability in December of last year . JavaScript is sometimes used as a delivery mechanism for a browser exploit ; meaning that if users turn it on , they may make themselves vulnerable to attack , which could ultimately reveal their identity . But this site doesn't just warn Vulnerability-related.DiscoverVulnerability people about the dangers of JavaScript . Tails is an operating system that routes all of a user 's traffic through the Tor anonymity network , and is designed to not leave any forensic traces on the host machine . The dark web child pornography site also blocks connections from Tor2Web gateways , which are proxies that people can use to access dark web sites without the protection of the Tor network . The site also allegedly stops people accessing it via mobile phone browsers .