I like the concept of this add-on. Marking people who are transphobic, and marking people who are "safe" for trans people. I used it for a whole year and felt a little safer on the internet because of it. But unfortunately, it seems like there's a bias at play.

Quite a few trans positive people are marked red seemingly because they don't subscribe to a specific set of ideas (which seems to be a specific kind of radical feminism?), including trans men talking about the unique oppression they face. And some people (mostly trans women in my experience) are marked as green even though they're mean to trans people who aren't like them or don't think like them.

It makes me sad to see this add-on used for bullying and infighting when it should be about who's marked as an actual threat to the trans community and who's safe to be around trans people in general.