2805: privacy.*.openWindows

user.js

@@ -1527,10 +1527,11 @@ user_pref("privacy.cpd.offlineApps", true); // Offline Website Data
 user_pref("privacy.cpd.passwords", false); // this is not listed
 user_pref("privacy.cpd.sessions", true); // Active Logins
 user_pref("privacy.cpd.siteSettings", false); // Site Preferences
-/* 2805: privacy.*.openWindows (FF34+)
- * We don't know what they do because we don't care what they do ***/
-user_pref("privacy.clearOnShutdown.openWindows", false);
-user_pref("privacy.cpd.openWindows", false);
+/* 2805: privacy.*.openWindows (clear session restore data) (FF34+)
+ * [WARNING] There is a years-old bug that these cause two windows when Firefox restarts.
+ * You do not need these anyway if session restore is disabled (see 1020) ***/
+   // user_pref("privacy.clearOnShutdown.openWindows", true);
+   // user_pref("privacy.cpd.openWindows", true);
 /* 2806: reset default 'Time range to clear' for 'Clear Recent History' (see 2804)
  * Firefox remembers your last choice. This will reset the value when you start Firefox.
  * 0=everything, 1=last hour, 2=last two hours, 3=last four hours