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.
Os ydych chi'n gweld “(32-did)” a'ch bod chi'n rhedeg { -brand-name-firefox } 56.0 neu'n hŷn, bydd diweddaru i'r fersiwn { -brand-name-firefox } ddiweddaraf eich uwchraddio i 64-did yn awtomatig.