To my knowledge, the chromium devs have said (and i am paraphrasing here) that maintaining such a large C++ codebase from a security standpoint is a figurative nightmare. I think they have only recently begun to start migrating some code to rust or other languages (i'm not 100% if they were also looking into Zig)

unfortunately, its based on c++... so could be a security nightmare unless they are very very careful :|