High Quality Content by WIKIPEDIA articles! In computing, Network Security Services (NSS) comprises a set of libraries designed to support cross-platform development of security-enabled client and server applications. NSS provides a complete open-source implementation of crypto libraries supporting SSL and S/MIME. NSS originated from the libraries developed when Netscape invented the SSL security protocol. AOL, Red Hat, Sun Microsystems, and other companies use NSS in a variety of products, including the following: Mozilla client products, including Firefox, Thunderbird, and SeaMonkey. AOL Communicator and AOL Instant Messenger (AIM)