[BitBucket user: Sébastien Jodogne]
[BitBucket date: 2016-07-15.09:47:19]

**What steps will reproduce the problem?**

Open Mozilla Firefox. Upload the files from a study with several dozens of DICOM instances, with the "Upload" tab of Orthanc Explorer. I used the TOUTATIX sample from OsiriX (that contains 2028 files for about 200MB).

**What is the expected output? What do you see instead?**

The transfer is tagged as successful, but the statistics of the Orthanc core report only 155 instances:


```
#!text

$ curl http://localhost:8042/patients/b2160db0-765812e8-d65568b3-3748b5c0-0b86bea2/statistics
{
   "CountInstances" : 155,
   "CountSeries" : 1,
   "CountStudies" : 1,
   "DiskSize" : "17527506",
   "DiskSizeMB" : 16,
   "UncompressedSize" : "17527506",
   "UncompressedSizeMB" : 16
}

```


**What version of the product are you using? On what operating system?**

* Orthanc 1.1.0 under Linux
* Mozilla Firefox 47.0

This problem does **not** seem to affect Chromium and Google Chrome.

**Temporary solution**

* Use Chromium or Google Chrome, or
* Use the ImportDicomFiles.py sample script.