Rated 3 out of 5 stars

Not what to say. This has always seemed to work but lately everytime I start Firefox, Eset Antivirus flags teesoft.info as:
Time;Scanner;Object type;Object;Threat;Action;User;Information;Hash;First seen here
11/14/2017 7:00:48 AM;HTTP filter;file;http://ww1.teesoft.info/?sub1=b6bd0990-c93a-11e7-82c2-05af9a003611;JS/Redirector.NDR trojan;connection terminated;CoolerMaster\Kent;Threat was detected upon access to web by the application: C:\Program Files\Mozilla Firefox\firefox.exe (92E905657C0B6ED442000D6A79D74367CF807296).;7ECDF2ADEF1F5A1F1FBFBF9A8450FAB0DBE4013C;
Is this extension safe or not?
Why is Eset flagging it?
Is it safe to tell Eset to ignore this teesoft threat or has teesoft a front for hackers? Help!