Mozilla has to take another approach if it wants to discover and fix the vulnerability feds exploited to infiltrate a child porn website. Washington US District Judge Robert Bryan has thrown out the organization's request for the security flaw's details. If you'll recall, the FBI seized the server of a child porn website on the Tor network called Playpen in early 2015. They then used a flaw in the Tor browser, which is based on Mozilla Firefox, to install malware that pointed agents to users' locations. They nabbed over a hundred people from that sting, including a defendant in one of Bryan's cases.