Only "Firefox on Android". The newer "Firefox Preview" and "Firefox Focus" mysteriously lost this ability. Firefox on Android is stuck on version 68, it's like Firefox' ESR version.
Fennec (old Firefox Android) supports addons. Fenix(? new Firefox Android) WILL support addons, they just haven't been implemented yet.
Firefox Focus does include some basic adblocking capabilities, but is more about being light on resource / data consumption.