I'm certainly sorry you're experiencing this issue. FireFox is actually one of two supported browsers right now, the other being Chrome. Would you mind clearing your cache, cookies, and history and trying again? Beyond that, could you see if the issue also happen in Chrome on the same computer or in a supported browser on a different computer?
This thread was the product of our fantastic collaborators during DIGITS Beta! As many terms have changed and bugs have been exterminated since the Beta launched, the information here may no longer be accurate. If you still have a question, please search our active threads or ask a new question in the DIGITS space!