I thought it was something with Firefox themes. It's confusing. They could've found different name.
Why didn't anyone point out the obvious solution of not only taking over the name of something that was not only another browser product, but another browser product from the same company. Sheesh. This just seems brain-dead to me. Personas isn't a bad name, but it's a very bad time to be using that particular name.
Why, when you're trying to launch a brand new product that is going to require a LOT of external buy-in, do you cripple it with this layer of confusion?