We have been using v24 till date and disabled local drivers and UNC path's using configuration available on MS link - http://social.technet.microsoft.com/Forums/en-US/8c478007-8412-48ba-8f95-0959d4c50ba5/disabling-firefox-from-browsing-drives However we have decided to upgrade to v39 and the same configuration is not working. Is there any other settling/configuration we can applied to disable local drivers and UNC paths in v39. Thanks you..