Not really the place for such questions. We are Firefox users helping other end users & not dealing with Firefox deployment in a corporate environment. You are probably better off using Firefox '''ESR''' and asking on their mailing list, rather than using the standard Release. * http://www.mozilla.org/en-US/firefox/organizations/ Each Firefox user will have there own Firefox profile and their own prefs.js file. You may deploy Firefox and lock settings using a ''mozilla'''.cfg''''' file Firefox deployments can make changes from the default on all of your installs. See * http://kb.mozillazine.org/Locking_preferences ** possibly utilising CCK https://addons.mozilla.org/firefox/addon/cck/