TinyMCE is working just fine, all except for the popup windows. They come up blank, and after a little bit of Google searching, apparently it has something to do with cross domain errors with Firefox and Django. I tried using document.domain, but I have a feeling that it doesn't work when you're using the Django development server (http://127.0.0.1:8000).
Instead of using 127.0.0.1:8000, if I use localhost:8000, everything seems to work perfectly. I'm not sure why. Maybe it's because localhost:8000 is a domain and 127.0.0.1:800 is not.