As far as I know, there is no Policy key for the Firefox home page, or perhaps for any preferences. Firefox's home page preference is stored in the user profile in a JavaScript file named prefs.js. A file named user.js can be created in the same folder to override prefs.js at startup. This poses a challenge for a login script because the user profile has a partially random name. A file named mozilla.cfg can be created in the ''program folder'' to default or to lock certain preferences. This may be more practical, you just have to account for the different location between 32-bit and 64-bit Windows. Some third parties have created packaging tools that may ease the process, but I don't have any personal experience with those. More information: * http://kb.mozillazine.org/Locking_preferences * http://www.mozilla.org/en-US/firefox/organizations/ (see mailing list)

See also: *http://mike.kaply.com/2012/03/15/customizing-firefox-default-preference-files/ *http://mike.kaply.com/2012/08/29/setting-the-default-firefox-homepage-with-autoconfig/ *http://mike.kaply.com/2013/04/24/major-changes-coming-in-firefox-21/ *http://mike.kaply.com/2013/05/13/more-major-changes-coming-in-firefox-21/