I think you have to bookmark them for them to post, not just thumb them up. You could also try hitting "refresh" under the Pandora favicon if you have bookmarked and they still aren't showing up. - Kamilah Gill

I agree with Anika, seems to be a problem for me too. Clicking refresh on the FF's Pandora config screen does indeed update my FF, but then if I bookmark a new artist on Pandora, FF does show it, that is until I click refresh again on the FF's Pandora config screen. Any one else has seen this? - Herve

Well, it finally showed up, just needed to wait 2 hours :) - Herve

Congrats, Herve. Mine still have never shown up and I listen to Pandora everywere, almost everyday. - Anika