Chrom{e,ieum} is an insane codebase. I run FreeBSD on many machines and
the patchset for a relatively common and modern OS that shares plenty of
details with Linux is large. Google wont even let the support live in
their repo, FreeBSD and OpenBSD have an external repo/patchset now to
collaborate on.
I would think Firefox would be a better target but Rust bringup would be
necessary.