File chooser defaults to "choose file" instead of "send" after choosing file

[firefoxlover]

Steps to reproduce:

1. click the "+" sign and choose a file
2. The file appears
3. press "Enter"

What happens:
The button "+" is pressed with the enter button, opening the file chooser again

What should happen:
Sending the file (there is no send button)

Workaround:
Click on the text area, then press Enter. Really weird and annoying behavior.

[zyphlar]

Confirmed in 6.1.0, I believe this is caused by the + button retaining focus, so it sounds like you're asking for the message box (or nonexistent send button) to take the focus instead to make sending attachments (or typing messages) smoother.