Never run a theme and persona together, it's not designed to work together and has severe bugs.
Firefox Beta rocks!!! Enjoy it.
If you have trouble, disable all add-ons, then enable them back slowly, see which one in the buggy one.
Create a new profile and start again building your add-ons one by one.
Let me know if you need Firefox debugging, I've been doing it with my themes for a while and I'll be happy to help.