> It's also worth pointing out that the developers at Mozilla literally decided to make a brand new programming language (Rust)

In my memory, that does not seem 100% right. And indeed https://en.wikipedia.org/wiki/Rust_(programming_language)#20... says a single developer who happened to work at Mozilla started it as a personal project.

After a few years Mozilla became interested in it and then sponsored its development, transforming it into the language it is today.