Blocking access to websites on Firefox?

Oh, just beware that if the person you are trying to block access to these website could also use a Proxy (aka a Circumventer)
 
You can block sites by editing the hosts file with notepad or by using a DNS server such as OpenDNS (www.opendns.com) which will allow you to block sites through their control panel.

In Windows XP/Vista the hosts file is located in "C:\Windows\System32\Drivers\etc"

Say the site you want to block is www.microsoft.com add the following line to your hosts file:

www.microsoft.com 127.0.0.1

and so on for each additional site adding 127.0.0.1 afterwards.
 
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