If you roll your eyes every time your Mac stalls for a moment for a new security update, don't ignore the Safari update released this week. Safari version 11.1.1 is an update that does require a restart, but it contains many stealthy security features that will protect your browser from being hijacked by trackers. One of them, called Intelligent Tracking Prevention, is designed to keep your browsing private. That's one way to avoid targeted advertising.
Also, another new feature called Sandboxing, prevents malicious code from taking over the whole browser by automatically opening anything questionable in a separate tab that can be easily closed. No more fake red alerts with siren sound effects from malicious websites.
That's browsing you can feel safe with!