Answers:
Firefox and the Mozilla Suite do not aspect built-in parental controls, content filter, pornography blocking, or website blocking features.
But you can any use third-party extentions for firefox
close to this:
http://www.glubble.com/about.php...
or this:
https://addons.mozilla.org/en-us/firefox...
or so this article about parental control contained by firefox:
http://mozillalinks.org/wp/2007/02/an-ap...
Extensions can provide content blocking for firefox, but they can be confidently disabled by a up to date user and cannot provide filter for other software, such as Internet Explorer or instant messaging applications.
or You start use other browser, approaching Maxthon
www.maxthon.com
base on internet explorer engine but beside more futures, and hold the parental control contained by your foot.
Good Luck