Internet-connected applications and plug-ins such as Adobe Flash Player, Adobe Reader and Oracle Java SE have great impact on the overall security level of your computer because outdated and unpatched versions of those apps enable ill-intended access to your PC via web browsers (Internet Explorer, Firefox, Safari, Chrome, Opera, etc). Needless to say, you must always keep both your web browsers and add-ons up-to-date (free tip: use Secunia PSI).
For Apple Safari, Google Chrome, Internet Explorer, Mozilla Firefox and Opera users there is a quick way of finding out whether most common browser plug-ins are secure and latest versions. Just visit my Browser and Plug-in Check page.
But even up-to-date software can leak sensitive information or enable tracking if it is unconfigured or misconfigured.
The following step-by-step guides on configuring applications for enhanced privacy and security are available:web browser security and other free security programs (links to step-by-step tutorials included).