I've had this add-on for several years, and I considered it useful until it came to light that in the past couple of years it's been marking certain people as anti-trans for... supporting nonbinary, intersex, and transmasculine people? I don't know what happened here, but this means that a tool that was once meant to help a vulnerable set of people has now turned into some sort of guessing game as to how reliable it is.
I rated this two stars instead of one because I've only encountered this issue on Tumblr whereas everywhere else (especially Twitter) it's been accurate. The only reason I still have it is to try and correct some of the falsely flagged ones I see.

EDIT: Seeing all the empty accounts here trying to claim this extension still works as intended and that the various transmasculine, nonbinary, intersex, and neopronoun users speaking up about this are wrong has made me bump this down to one star. What a shame for what used to be such a useful add-on.

this add on is amazing and i often recommend it.
please let us know if you are working on a fix for the tumblr dashboard only blog problem, we cannot flag TERFs anymore

this app is amazing and potentially lifesaving - but please can it be fixed so it works on tumblr again!!

Excellent add on, but badly needs an update to allow users to tag tumblr blogs set to "dashboard view only." Tumblr is one of the spaces where Shinigami Eyes is the most consistently used, but in the past month it's become practically useless, since all the anti-trans blogs have learned to set their blogs to dash-view only. Update soon, please!

It would be far far more useful if you could view the individual item that caused someone to flag the link as anti-trans (especially for social media). There's a bit of a thing with the relative lack of moderation and verification that might even be present but not super viewable. Overall it's SUPER useful when browsing the web and social media. Also doesn't work on instagram for some reason.

absolute lifesaver for most sites but I'm seconding calls for an update so it works again on tumblr, please

Needs an update, it's been useless on Tumblr ever since they changed the way user urls are formatted from 'user dot tumblr dot com' to 'tumblr dot com slash user'. Now you can't mark profiles and they no longer show up as green or red. Works well for other sites though.

I recommend you, human rights activists, to install this extension if you stand for trans people.

This is a lovely extension! super helpful to identify trans friendly people as well as terfs/GCs. As a trans person on twitter this is necessary.

a wonderful tool for spotting transphobes, absolutely recommend!