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How do I block a site?

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I know there is (or used to be) a way to block sites that annoy me. That's why I prefer Firefox to the other one. But I cannot find it any more. And there is no help reference to it.

I know there is (or used to be) a way to block sites that annoy me. That's why I prefer Firefox to the other one. But I cannot find it any more. And there is no help reference to it.

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You can use the HOSTS file which will block websites for all the browsers you have installed on that PC.
http://en.wikipedia.org/wiki/Hosts_file
http://www.mvps.org/winhelp2002/hosts.htm

Or, you can install the BlockSite extension for Firefox.
https://addons.mozilla.org/firefox/3145/