Drag and drop does not work on Linux with Firefox

[jhowes-titanium]

Hello!

This issue is very simple. As described above, I am not able to drag and drop the file on Linux with Firefox.

I assume the addition of a simple "Upload File" button would immediately fix this, but that's just a suggestion.

Thank you for making this tool btw!

[ToTkToSmOtRiT]

The same thing on Windows with Opera