Update 'config/distribution/policies.json'

✅ Enabled SanitizeOnShutdown (All) (clear all data on shutdown, including Browsing & Download History, Cookies, Active Logins, Cache, Form & Search History, Site Preferences and Offline Website Data) 
⛔️ Disabled FormHistory (turn off saving information on web forms and the search bar)
⛔️ Disabled SafeMode (disable safe mode within the browser)
⛔️ Disabled NewTabPage (disable the New Tab page)
ℹ️ Set to keep cookies until you close FF

config/distribution/policies.json

@@ -10,7 +10,7 @@
     "Cookies": {
       "Allow": ["http://example.org/"],
       "Block": ["http://example.edu/"],
-      "ExpireAtSessionEnd": false,
+      "ExpireAtSessionEnd": true,
       "Locked": false
     },
 
@@ -28,12 +28,16 @@
 
     "DisablePasswordReveal": true,
 
+    "DisableFormHistory": true,
+
     "DisablePocket": true,
 
     "DisableProfileImport": true,
 
     "DisableProfileRefresh": true,
 
+    "DisableSafeMode": true,
+
     "DisableSecurityBypass": {
       "InvalidCertificate": true,
       "SafeBrowsing": true
@@ -62,7 +66,7 @@
       "Allow": ["http://example.org/"],
       "Block": ["http://example.edu/"],
       "Default": false,
-      "Locked": false
+      "Locked": true
     },
 
     "FirefoxHome": {
@@ -76,13 +80,14 @@
 
     "Homepage": {
       "URL": "about:blank",
-      "Locked": true
+      "Locked": true,
+      "StartPage": "none"
     },
 
-    "NewTabPage": false,
-
     "NetworkPrediction": false,
 
+    "NewTabPage": false,
+
     "NoDefaultBookmarks": true,
 
     "OfferToSaveLogins": false,
@@ -129,6 +134,8 @@
       "Locked": true
     },
 
+    "SanitizeOnShutdown": true,
+
     "SearchEngines": {
 	    	"PreventInstalls": false,
 	    	"Remove": ["Bing", "Google", "Twitter", "Amazon.com", "eBay"]