This is not yet a built in Firefox feature, but it can be done by using the [https://addons.mozilla.org/en-US/firefox/addon/public-fox/?src=collection&collection_id=d2623169-e41c-4c6f-a2bd-af3e3914dd14 Public Fox] add-on to set a password to these settings.

@-moz-document url-prefix(about:addons) { #addons-page { display:none !important; } }

Note that any restriction added by an extension can easily be bypassed by starting Firefox in Safe Mode (i.e. holding down the Shift key when you start Firefox). So this will only work with very young children that do not know their way around with Firefox. It is possible to lock the home page with a mozilla.cfg file to prevent changing this page. See: *http://kb.mozillazine.org/Locking_preferences *http://mike.kaply.com/2012/03/16/customizing-firefox-autoconfig-files/ Other settings that are saved as a pref can be locked as well, but you can't prevent them from clearing the history or disabling extensions and plugins. You could hide the about:addons page with code in userContent.css. <pre><nowiki>@-moz-document url-prefix(about:addons) { #addons-page { display:none !important; } }</nowiki></pre> The customization files userChrome.css (user interface) and userContent.css (websites) are located in the chrome folder in the Firefox profile folder. *http://kb.mozillazine.org/Editing_configuration ---- See also: *CCK2 Wizard: https://addons.mozilla.org/firefox/addon/cck2wizard/