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.
Jolic tam „(32-bitowy)“ stoj a Firefox 56.0 abo staršy wužywaśo, dostanjośo pśi aktualizěrowanju na nejnowšu wersiju Firefox awtomatiski 64-bitowu wersiju.