Original sentence: Care should be taken to prevent information leaks.For even trustworthy anonymizers, anonymizers cannot filter out any malicious code that may reveal the identity of the user who wishes to remain anonymous.For example, anonymizing a HTTP connection but not a DNS lookup can reveal the location of the viewer.There are many purposes for using anonymizers
Edited sentence: A Firefox plugin called Noscript achieves the same goal.For even trustworthy anonymizers, anonymizers cannot filter out any malicious code that may reveal a user's identity, who wishes to be anonymous.For example, if a user uses an anonymizer to keep him/herself anonymous from a website that they wish to visit, the website can send malicious Javascript code to the anonymizer where it's relayed to the unsuspecting user's computer.However, malicious code can come in many forms and may not necessarily exploit the web browser but the user's operating system.The malicious Javascript code will be executed in the user's web browser to collect private information that may identify him (ie: the user's IP Address) so it can be sent back to the website and record the user's identity.There are many purposes for using anonymizers, some legitimate.To avoid this, disable any scripting languages because they are inherently dangerous by disabling scripting in the browser.Updating an operating system with the latest security patches is recommended to prevent such exploitation