Sorry for the trouble you're having! I'll see if I can help you out. Can you disable all of your other add-ons, restart Firefox, and see if it works then? Other users have had problems with add-on conflicts. If that's the issue, then you should re-enable your add-ons one at a time until you've found the one that is breaking LJ Juggler.
If that doesn't help, we'll start digging into what the web console has to say in Firefox.
