You surf the internet with a browser (Internet Explorer, Google Chrome, Firefox, Safari, etc.). Staying secure on the Internet REQUIRES you to run the latest versions that are patched.
The browser probably does a decent job of telling you if it's got the latest version or updates. It'll popup to tell you a new update is available, or it'll just download and perform the update for you automatically.
But what about some of the other critical plugins such as Java, Adobe, Silverlight, QuickTime, etc?
I came across this pretty nice tool made by Qualys that I recommend you make your homepage, so that everytime you load your browser, it runs a quick scan and tells you if you're secure. Try it out! https://browsercheck.qualys.com/?scan_type=js
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