Bug 463885 - Entering the Private Browsing mode may not always empty the...

Bug 463885 - Entering the Private Browsing mode may not always empty the download manager list; r=sdwilsh, a=blocking1.9.1+

toolkit/mozapps/downloads/content/downloads.js

@@ -504,8 +504,14 @@ let gDownloadObserver = {
         break;
       case "private-browsing":
         if (aData == "enter" || aData == "exit") {
-          initStatement();
-          buildDownloadList(true);
+          // We might get this notification before the download manager
+          // service, so the new database connection might not be ready
+          // yet.  Defer this until all private-browsing notifications
+          // have been processed.
+          setTimeout(function() {
+            initStatement();
+            buildDownloadList(true);
+          }, 0);
         }
         break;
     }