It has shown this. > Even more recently, researchers discovered two "critical" security flaws actively being exploited in Mozilla's open-source Firefox browser

It has shown this. > Even more recently, researchers discovered two "critical" security flaws actively being exploited in Mozilla's open-source Firefox browser. Additionally, the open-source Linux operating system was just hit in "its most high-severity vulnerability in years." OK, but these security flaws are ubiquitous in closed source software as well. The difference in FOSS is the source is there for people to look at and scan for security bugs if wanted, and is there for people to patch when needed as well. Closed source has these problems as well, it is all just less public.