This is no longer an extension for telling who is transphobic, but rather one used for discourse and infighting between members of the trans community.

I used to recommend this app to people, but at this point it's no longer a useful tool, nor can I in good conscience recommend it to anyone. Transmascs are marked red simply for talking about their experiences with transphobia and using a term to describe their experience. Intersex people, including intersex trans people, are marked red for calling out intersexism within the trans community. Trans POC have been marked red for calling out racism within the trans community. The devs are aware of the criticism, but have chosen to double down.