Very small (but important) parts of firefox are written in Rust

It is 9.5% of the total code base, that’s even counting things like tests. I wouldn’t personally call that “very small” but ymmv.

That also said your parent equating memory safety to “no crashes” is also not correct. A process can exit early while never violating memory safety.

And even if Firefox was written in 100% Rust, Rust can still panic for logic errors. And system libraries have their own bugs and crashes that can bring down Firefox.

It depends a bit on your definition of "crash".

Rust has a `panic!()` macro which will hard-terminate the program and log a stack trace in what is functionally equivalent to a crash. It can be called in various scenarios... including out-of-memory situations (like the ones being addressed in the fine article and this thread).

Is this satire? Rust eliminates memory errors such as use-after-free. Unlike C and C++, `myVec[usize::MAX]` will `panic!` if `myVec` isn't actually that large.