Which browsers does FocusDragon support?

Safari — extension ships with the app. Enable it in Safari → Settings → Extensions.
Chrome — extension available on the Chrome Web Store. Search "FocusDragon" or check the Extensions page in the app for the link.
Edge, Brave, Arc, Opera — can install the Chrome extension from the Chrome Web Store.
Firefox — not yet supported. Firefox tabs are not monitored by the AI assistant; DNS-level blocking still works.