It's not. You may as well be comparing C++ to Swift. Chrome has had a lot more time and resources put into it anyway while Quantum has only seen release for two

It's not. You may as well be comparing C++ to Swift. Chrome has had a lot more time and resources put into it anyway while Quantum has only seen release for two years. That said, you're better off comparing CVE counts for Firefox vs Chrome. That said someone could craft a malformed legacy font file that has to be parsed by some dusty win32 code and BOOM!