This is part of the Sendori web browser toolbar and extension that will modify the browser's default search provider, DNS, and home page functions. smime3.dll is the Mozilla Network Security Services (NSS) library is designed to support cross-platform S/MIME development of security-enabled client applications and is recompiled by Sendori, Inc. The module smime3.dll, “NSS S/MIME Library” by Sendori, Inc 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.