Firefox add-on for Mac no longer functioning

Hello,

This was by far my favourite Firefox add-on but the other day it stopped working.

At first I received an XML error saying it needed authentication. No worries, I just setup an account (I was uploading without an account before). Okay, so then I setup an account and attempted to login through the preferences panel. No dice. Just the spinner-no-return at the login popup. So nothing.

Any ideas? I'm running 10.9.4 of OS/X and running Firefox version 32.0.3.

Login popup:
http://i.imgur.com/gUupofJ.png

Error at upload:
http://i.imgur.com/DbtiRyX.png

tmbo80