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Unfortunately information on add-on download page is very outdated. An additional flaw is that in add-ons manager under [More] you will find a link to no longer existing(?) domain "teesoft.info", if you click it you might be forwarded to really suspicious websites. May be this is meant by the Virus warnings in some other reviews? Panda Antivirus rates the add-on itself as virus free.
The add-on itself is useful, and a [Converted] version works fine with my unofficial (akalla) English SeaMonkey 2.46 (Windows NT 6.1; WOW64; rv:49.0) Gecko/20100101 Firefox/49.0 Build 20160923004119 (Default Classic Theme) on German WIN7 64bit.