freebl3.dll is the Mozilla NSS FreeBL is a shared library dependency to support security-enabled client programs, NSS provides a complete open-source implementation of the crypto libraries and is recompiled by OOO . The module freebl3.dll, “NSS freebl Library” by OOO has been detected as adware by 1 anti-malware scanner with very strong indications that the file is a potential threat. Although a detection has been made for this resource, it is generally a commonly distributed 3rd-party library and is typically safe by itself.