SanitizeOnShutdown

There are two policies that allow for sanitizing (clearing) local data on shutdown in Firefox. You may clear all data, or choose from one or more of Browsing & Download History, Cookies, Active Logins, Cache, Form History, Site Preferences, and Offline Website Data:

• SanitizeOnShutdown (All): Clear all local data on shutdown.
• SanitizeOnShutdown (Selective): Clear specific types of data on shutdown.