How can I block a website to access my PC

There are sites like "regcleanpro" that cannot be closed or deleted once he had access by other means and is just a dam to bother. Why doesn't Firefox allows me to make a list of Web sites that are not allowed access to my PC and block immediately when they try?

Block site - https://addons.mozilla.org/en-US/firefox/addon/blocksite/ - allows you to block websites to be loaded in Firefox. But the Windows HOSTS file can be used to block Web sites to be loaded by any program on that PC, so it is more effective for preventing malware to access Web sites and loading of these sites in Firefox.

http://en.Wikipedia.org/wiki/Hosts_file

http://www.MVPs.org/winhelp2002/hosts.htm

Tags: Firefox

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