Via 32-Bit Firefox Users on 64-Bit PCs Will Be Auto-Upgraded to 64-Bit Firefox, starting with version 56, Firefox will "silently and forcibly auto-upgrade" users running the 32-bit version of Firefox on 64-bit computers with more than 2GB of RAM to the 64-bit version. Version 55 is scheduled for release August 8 and Version 56 is scheduled for September 26.