I found a great extension for chrome/firefox for those of you who are parents or just want to block sites you think are not appropriate on your browser. It simply blocks access to sites you enter or sites with keywords. There is an adult protection slider and you can password lock it.
For Chrome: http://chrome.google.com/webstore/detail/block-site/eiimnmioipafcokbfikbljfdeojpcgbh?hl=en
For firefox: http://addons.mozilla.org/en-US/firefox/addon/blocksite/
For Chrome: http://chrome.google.com/webstore/detail/block-site/eiimnmioipafcokbfikbljfdeojpcgbh?hl=en
For firefox: http://addons.mozilla.org/en-US/firefox/addon/blocksite/