--- a/uriloader/exthandler/nsExternalHelperAppService.cpp
+++ b/uriloader/exthandler/nsExternalHelperAppService.cpp
@@ -1003,19 +1003,26 @@ nsExternalHelperAppService::LoadURI(nsIU
   nsHandlerInfoAction preferredAction;
   handler->GetPreferredAction(&preferredAction);
   bool alwaysAsk = true;
   handler->GetAlwaysAskBeforeHandling(&alwaysAsk);
 
   // if we are not supposed to ask, and the preferred action is to use
   // a helper app or the system default, we just launch the URI.
   if (!alwaysAsk && (preferredAction == nsIHandlerInfo::useHelperApp ||
-                     preferredAction == nsIHandlerInfo::useSystemDefault))
-    return handler->LaunchWithURI(uri, aWindowContext);
-  
+                     preferredAction == nsIHandlerInfo::useSystemDefault)) {
+    rv = handler->LaunchWithURI(uri, aWindowContext);
+    // We are not supposed to ask, but when file not found the user most likely
+    // uninstalled the application which handles the uri so we will continue
+    // by application chooser dialog.
+    if (rv != NS_ERROR_FILE_NOT_FOUND) {
+      return rv;
+    }
+  }
+
   nsCOMPtr<nsIContentDispatchChooser> chooser =
     do_CreateInstance("@mozilla.org/content-dispatch-chooser;1", &rv);
   NS_ENSURE_SUCCESS(rv, rv);
   
   return chooser->Ask(handler, aWindowContext, uri,
                       nsIContentDispatchChooser::REASON_CANNOT_HANDLE);
 }