Document from the year 2014 in the subject Computer Science - IT-Security, grade: 1, -, language: English, abstract: Today in the growing era of communication everyone wants to update with the new functionality so that they would survive with the best. Since the only way to access Internet is the browser, so it is vital to configure them securely. With the growing demands to ease the work in one click many engine tools, supportive plug-ins have been developed for web-browser. And the users also without knowing its causes quickly installed such extensible plug-ins in their browsers which gives the chances to intruders to get control their computer without their knowledge. Such plug-ins becomes victim for the vulnerabilities of the computer which are due to the manufacturer coding fault.