> Yes, but they are replacing it bit by bit - I mean, they even started Rust for exactly that purpose. So (without being a huge fan of Rust) the decision to start a "greenfield" browser project in a memory-unsafe language is questionable IMHO...

Maybe, but the speed with which SerenityOS, its programs and the browser has been implemented, with so few man-hours thrown at it kinda displays why C++ was chosen over Rust.

There is no comparable project in Rust that demonstrates just how quick you can go from "nothing" to Full-Fledged OS, with applications, with a browser.

Just from the Serenity project (if you've been following it), it looks like C++ is about 10x faster to write performant and safe code in than Rust.