--- a/OrthancExplorer/file-upload.js	Thu Oct 29 11:25:45 2015 +0100
+++ b/OrthancExplorer/file-upload.js	Fri Oct 12 15:18:10 2018 +0200
@@ -48,6 +48,11 @@
 
 
 $('#upload').live('pageshow', function() {
+  alert('WARNING - This page is currently affected by Orthanc issue #21: ' +
+        '"DICOM files might be missing after uploading with Mozilla Firefox." ' +
+        'Do not use this upload feature for clinical uses, or carefully ' +
+        'check that all instances have been properly received by Orthanc. ' +
+        'Please use the command-line "ImportDicomFiles.py" script to circumvent this issue.');
   $('#fileupload').fileupload('enable');
 });