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Are you not able to view part of your form in firefox then from what I am understanding? I checked this but I am able to view it without any issue.
Should you still be unable to view it then at that point I would recommend making sure you are using the latest version of your browser. Otherwise, let us know if this continues.
Additionally, I also just checked this on our Mac Emulation Program in OSX Mavericks and I see it's working there too since I noticed your screenshot is from a Mac.
Is that the OSX you are using on your end? If not please let us know so we can look into it more.