This is very impressive, but I’ll be honest, I wouldn’t want to expose any new software written in C to the internet.
Here's one reference: https://msrc-blog.microsoft.com/2019/07/18/we-need-a-safer-s...
So while other software that isn't Microsoft most certainly has memory safety bugs, this blog doesn't speak for those, only Microsoft's.
The only part that Mozilla is indicated is in reference to Rust.