npub1fdcpfzaqf28emyhg7rw7wtfmy6xeqcvt5wezr6j7saeskx6zm47sqr82j5 (npub1fdc…82j5) Chrome is factually more secure than Firefox.
Here's an article from 2020 describing lower-level details. Some of it may be out-of-date, e.g., I think that Fx's JIT was reimplemented, but should give you a pretty good idea:
https://madaidans-insecurities.github.io/firefox-chromium.html