Applying Personas Themes on top of custom themes? Rated 5 out of 5 stars
OK, I stumbled upon this solution for Applying a Persona(lightweight) Theme to any Third Party Theme without using any extension. View my post here: https://forums.mozilla.org/addons/viewtopic.php?f=30&t=2636This review is for a previous version of the add-on (1.6.2). This user has a previous review of this add-on.