NIS 2013 Mozilla Instantbird nssckbi.dll flagged and removed cloud threat?

I just updated instantbird through the internal updater. Previous version was 1.2 and it updated to 1.3 NIS 2013 flagged that file though for some reason and removed it? Is that not a legit file? I believe its a false positive? Safe to restore? And if so. Will it flag and remove it again during a system scan? I am including a picture. I literally have the window still open right now as I don't know what to do.

 

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