How do I block all sites except a few?

We want clients to only have internet access to five websites. Is there a way to do this?
All computers are either XP Home 2002 32 bit or Windows 7 64 bit
We are using Firefox 15.0
Thank you.

The easiest way to block websites in Mozilla Firefox is by using a third-party add-on called [http://goo.gl/QePcl Web Filter]. The Filter extension blocks sites that have been added to its "blacklist," but it can also be set up to disable any links to the blocked sites by showing nonfunctional text instead of hyperlinks. The Filter also has a "password protection" feature that helps prevent unwanted changes to BlockSite by others.

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