In my experience, those marked red tend to fall into two categories: "person/group so outwardly transphobic that the marking, though accurate, is unnecessary" and "trans/nonbinary/intersex person who got into argument with a(nother) trans person but showed no evidence of transphobia, even when I went looking for it." Not every marking falls into those two categories, but the latter happens frequently enough that I don't trust Shinigami Eyes to be accurate when it actually matters.

I thought all the 1 star reviews were just a bunch of transphobes but no this thing just randomly marks people, basically anything that talks about trans people will be marked red regardless of context

Horribly transphobic extension! It marks trans men/mascs, nonbinary people, and intersex people as "transphobic" for simply talking about the oppression they face, meanwhile trans women/fems are allowed to be as racist, ableist, and laterally queerphobic as they want, and they're somehow fine. The creators of this extension should be ashamed of themselves. At best, there's no oversight or verification of any kind to prevent this, and at worst, this is something they actively encourage. Absolutely disgusting.

Rather than correctly marking people as trans friendly/anti-trans it's being weaponized to pit Trans siblings against each other. Unless you're purposely trying to fracture the trans community, DO NOT INSTALL. Shinigami eyes cannot be trusted.

this is not useful, easy for misinformation to spread via mass flagging campaigns. it is better to make your own opinions of someone. similar to AI it is not good to outsource your thinking ability.

this might actually be THE most transphobic extension ever created. like genuinely this thing hates trans people so much its unreal

unfortunately it's useless when you can't see why someone was flagged. a lot of people criticizing anti transmasculinity get flagged as red and a lot of straight up bigoted, enbyphobic, people who hate trans men get flagged green with no way to correct that. I'm very disappointed

Haven't had this extension installed for years. Went to see just how bad it's supposedly gotten and. Yeah they weren't kidding. Tons of trans-friendly blogs marked red, and people who will say the most hateful things you've ever read about a group of trans people will be marked green. It has been taken over by those pushing the new wave of radical feminism with a "trans-friendly" coat of paint. And make no mistake: it is absolutely repackaged radfem rhetoric. It serves only to divide the community and isolate vulnerable transfeminine people.

It's been hijacked by TRFs, Transandrophobs, Exorsexists, Intersexists, and Racists, AS WELL AS, petty folks with harassment campaigns and is no longer reliable.

Unreliable; frequently flags the wrong accounts

This extension was originally a great concept, but the database has been compromised by inaccurate reporting. A significant number of accounts currently flagged red are run by nonbinary, intersex, and transmasculine creators who actively promote trans-positivity.

Many users trust this tool to help them navigate online spaces safely, but it's currently doing the opposite by promoting false accusations and internal division. The developers need to step in, audit the database, and establish proper verification protocols.

I highly recommend avoiding this tool until it's properly moderated.

why are all trans men marked red? why people saying transandrophobia isn't real are marked green?

me when everyone who's not transfem is a bigot, but apparently not alexander lukashenko

Installed it to check what all the drama was about, checked only on tumblr.
Reviews claim news articles and such are often marked correctly, which I have not tested and can thus not comment on.

Accounts marked green were a crapshoot between "good trans advocate" and "at bare minimum raising eyebrows with their stances on transmen or enbies".

Meanwhile of all the accounts I follow that were marked red, multiple were positivity accounts for more 'niche' or 'controverse' topics - including accounts for enby-related stuff, xenogenders, or even one that just spreads positivity about all types of plural systems.
At least one of which had nothing to do with transness at all? But I digress.

Multiple accounts that were outspoken about transmasc issues who dared occasionally point out transfems who were hostile towards transmascs were also marked red, despite not being transmisogynistic.

As such, my final verdict:
Either due to a lack of moderation, deliberate misuse by the community, or both, this tool has gone from a good idea to falsely marking innocent users as red for mild disagreements, oft with transphobic intent (how ironic).

I cannot reccommend using it.
If you still decide to use it, at least don't take the red or green markers as definitive - actually check accounts, and consider critically why someone might have been marked green or red.

(Additionally, accounts that praise shinigami eyes to the high heavens whilst unwilling to admit any flaws with it are sus as hell, which is useful when using tumblr as well.)