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. libnspr4.dll is the Netscape Portable Runtime (NSPR) libary that provides a platform-neutral API for system level and libc-like functions and is recompiled by Sendori, Inc. The module libnspr4.dll by Sendori, Inc has been detected as adware by 1 anti-malware scanner with very strong indications that the file is a potential threat. Note, this is a common distributed file and although it has been detected it might not be a threat is un-coupled from its distribution source.