If you see “(32-bit)” and you are running Firefox 56.0 or older, updating to the latest Firefox version should automatically upgrade you to 64-bit.
Jeli tam „(32-bitowy)“ steji a Firefox 56.0 abo starši wužiwaće, dóstanjeće při aktualizowanju na najnowšu wersiju Firefox awtomatisce 64-bitowu wersiju.