The most recent target for the NSA or National Security Agency is the anonymity network, Tor. It is said that the online network is a top priority for the NSA. Many believe that the attacks on Tor were made by NSA’s Application Vulnerabilities branch, a part of SID or Systems Intelligence directorate. Most of the agencies employees are working for SID who are then assigned to collect data from all communication systems in the world.
According to Edward Snowden, a whistle blower of NSA’s secret, said that the agency have successfully exploited Tor’s group of browsers. This includes users of their Firefox browser.
Source: The Guardian