Even if you disable some items in the Tools > Clear Recent History list then it is still possible to remove history items in the History sidebar (View > Sidebar > History).

• https://support.mozilla.com/kb/Clear+Recent+History

Best would be to lock the corresponding privacy.cpd.* prefs via a file mozilla.cfg

• http://kb.mozillazine.org/Locking_preferences

Dear Cor-el,

I am unable to resolve my problem, Kindly tell me specifically so that i can restrict my end users to delete their browsing history of mozilla firefox.

Thanks.