Adobe Flash is now in Apple's App Sandbox in Safari for OS X Mavericks
Adobe Flash at one time was the standard multimedia plugin for web designers. It was used to embed everything from videos to advertising. However, it has also been the favorite of those who write malicious code and want to find their way into your computer. The years of battling malware exploits is over, on Apple computers that is.
As Apple states on their site,
App sandboxing isolates apps from the critical system components of your Mac, your data, and your other apps. Even if an app is compromised by malicious software, sandboxing automatically blocks it to keep your computer and your information safe.
This is a welcomed change for many in the IT departments that have had a constant battle with effects of Adobe Flash player on their computers.