10.14.6 is the last 32-bit supporting version of macOS. That's a shame. I've maintained it for backwards compatibility with high-end 32-bit apps like PhotoShop CS3, iZotope RX and others. I guess it's time to switch full time to Firefox on that Mac. Apple claims to be "Green" but forcing the retirement of older computers (via lack of security updates and eventual dropped software) is anything but. My 2012 Mac works perfectly fine with a 2TB SSD and 16GB of ram added. I've been waiting for an M3 to buy a new one, but still planned to use the old one for hosting the whole house movie server and older apps.