Mozilla is FINALLY pulling the plug on 32-bit Firefox builds for Linux, a decade after Google Chrome did the same. Why now? It says they're getting hard to build.
The i386 architecture is now only intended to be used on a 64-bit (amd64) CPU. Its instruction set requirements include SSE2 support, so it will not run successfully on most of the 32-bit CPU types that were supported by Debian 12.
The i386 branch still exists, they dropped the installer.
You can upgrade a Debian 12 i386 system just fine to Debian 13
They did explicitly said that it’s completely unsupported scenario. It’s only for multiarch usage so even kernel isn’t provided.
From https://www.debian.org/releases/trixie/release-notes/issues.en.html#reduced-support-for-i386
That depends on the specific CPU model used: