wrt. Discord and their stance on "self-bots", what is the demarcation point between their (web) app and my computer?

Is using a screen reader a self-bot? Is a non-screen reader Firefox add-on that uses the API a self-bot? What if I write an add-on that keeps track of Discord-specific state via it? What if that add-on exposes an API to read my DMs? What if it exposes an API to send them?