Firefox has no built-in parental control features, you can do this with a third party application such as the free K9 Web Protection - http://www.k9webprotection.com Another free method of blocking access to adult sites is the free openDNS family shield - http://www.opendns.com/familyshield Both of the above will work with all browsers, not just Firefox. To block downloads, you can use the Public Fox add-on to block downloading of types of files that you choose such as .exe files - https://addons.mozilla.org/firefox/addon/public-fox