blocking websites on firefox

[tenerifemuffin]

hi, i dont know if this is the right thread but i was wondering if anyone knows how to block websites on firefox. We need to do it to keep an 11yr boy out of a certain site.
Any suggestions?
Thanks everyone zoe

[Jewels]

FF doesn't have built in blocking capabilities, but you can install this addon to accomplish the task.

https://addons.mozilla.org/en-US/firefox/addon/3145

Bear in mind however that a lot of kids are smarter when it comes to the pc than their parents are and can quickly overcome this type of stuff. If your child falls into this category you are better off putting a password on the router configuration and blocking access to the offending site through the router's firewall rules.