For anyone wondering, the current review bombing of Shinigami Eyes is related to a particularly viscious tumblr discourse that has resulted in harrassment campaigns against a number of trans women. I have used this add-on for about 2 months now and have found it to be fine, with one case of a true false flagging. It's not perfect - I would encourage anyone using this application to quickly investigate the reason for a green or red marking - but it is hardly unusable. Generally, it has been pretty accurate. But remember it only tells you how someone generally posts about trans people and issues online, and nothing more.