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How do I block access to a website?

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Is there a way to block access to a ceratin IP-address or URL in Firefox 3.6.13? For example, if I don't want my 12 year old son to be able to surf to http://www.sexy-babes.com or http://www.jews-are-bad.org, can I block that site or IP-address from access?

Is there a way to block access to a ceratin IP-address or URL in Firefox 3.6.13? For example, if I don't want my 12 year old son to be able to surf to http://www.sexy-babes.com or http://www.jews-are-bad.org, can I block that site or IP-address from access?

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