You can use the [https://addons.mozilla.org/firefox/addon/public-fox/ Public Fox] add-on to lock down quite a few features including clear private data window.

Remember that Public Fox is an extension and extensions can easily be bypassed and disabled by starting Firefox in [[Safe mode]].<br /> * http://kb.mozillazine.org/Parental_controls ---- Your above posted system details show outdated plugin(s) with known security and stability risks that you should update. *Java Plug-in 1.6.0_05 for Netscape Navigator (DLL Helper) Update the [[Java]] plugin to the latest version. *http://www.oracle.com/technetwork/java/javase/downloads/index.html (Java Platform: Download JRE)