haven't tried/used seamonkey for a few years but it looks like they still do 32bit:
I own a Dell INSPIRON mini 10, CPU is Intel Atom A270 at 1.6GHz with 1GB RAM and 16GB SSD, display 10 inch, from stone age (year 2006-2009 maybe).
It doesn't have a scratch, perfect functional (if you forget the dead battery). So it has no x86-64 instructions.
Except this laptop, I can bet that (almost) never in my life I will BUY a device with CPU on 32 bits + BIOS. First of all that all NEW laptops are UEFI + 64 bits CPU (in the countries where I travel /stay), and I do not intent to buy old devices (they can be near their end of life because wearing parts, excessive usage etc.).
Therefore 32 bits will be useful in containers, isolated / virtual machines , in our days of
concern about security and privacy (for people who care). At least is a step in the right direction for protection, and speed.
FYI: Ideal software for me is code written in ASM (machine code) as Kolibri OS, or maybe x32 (small pointers 32 bits + large CPU registries 64 bits), but not much software as this in Linux distros.
https://wiki.debian.org/X32Port
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