Thanks you for your work. It seems to be exactly what I was looking for, but unfortunately, you are using the NPAPI for Chrome and Chrome has stopped to support it since September 2015.
Therefore, it is impossible to see the Send/Receive button and Oracle doesn't give any advice to fix this problem on Linux (they just say to use IE on Windows and Safari on Mac...).
Is it possible for you to fix this? I am using Chrome (v46.0.2490.80 (64-bit)) and Firefox (42.0).