Pandora does work with Firefox 7...but if you're having trouble like I was after updating FF, you'll need to uninstall it and then reinstall without any addons. Then one-by-one, add the addons that you like and try Pandora after each addon installation. If it stops working, you'll have to uninstall FF and then go through the procedure again. The addon that was causing Pandora to fail to complete the load process for me was Flashblock. Once I reinstalled without this addon, Pandora worked great.