Puntuado con 5 de 5 estrellas

I'm trying to combine Phoenity with persona switcher but it doesn't work. Can you explain more in details hox to proceed.
Thanks a lot

Esta valoración es de una versión anterior del complemento (3.5.25). 

1. Install Phoenity Shredder, Persona Switcher and some Light Weight Theme(s).
2. Select Phoenity Shredder as your theme and restart Thunderbird.
3. Select a Light Weight Theme using Persona Switcher's toolbar button or menu item.