Used to be a useful add-on but the developers have fallen into inter-community discourse and shown themselves to harbor intersexist and anti-transmasc sentiments. This includes but is in no way limited to: not seeing using use of "theyfabs" (a term to mock afab nonbinary people) as transphobic, labeling intersex users as transphobic for speaking out against intersexism, and generally denying that afab trans people can face targeted harassment.

Post-script: yeah no looks like the dev only cares about transphobia that harms trans women and is intersexist as well.