As far as I know, Firefox does not read the Policy key, so conventional group policy approaches do not work. You can modify Firefox's behavior using Autoconfig files, which are deployed in the Firefox program folder. See, for example, http://kb.mozillazine.org/Locking_preferences You also may want to explore Mike Kaply's site for extensive articles on centrally managed deployments of Firefox (either ESR or the mainstream release): https://mike.kaply.com/ It might also be useful to join and search the Enterprise Working Group (EWG) mailing list. There's a link on this page: http://www.mozilla.org/en-US/firefox/organizations/