If you see “(32-bit)” and you are running { -brand-name-firefox } 56.0 or older, updating to the latest { -brand-name-firefox } version should automatically upgrade you to 64-bit.
We natz'ët “(32-bit)” chuqa' nasamajij ri { -brand-name-firefox } 56.0 o jun pa xulan, k'o ta chi pa ruyonil nuk'ëx ri' rik'in ri ruk'isib'äl ruwäch richin ri 64-bit.