Add Feature To Existing Firefox Addon. (2)

![][1]We currently have a toolbar (see attatched) that allows you to use windows media player and vlc player to play radio stations. In order to use vlc the player itself and the plugin both have to be installed. Currently, we have a prompt that notifies users that they need to install vlc player and the plugin, if not already installed. We want to make this prompt recognize whether vlc player is installed and whether vlc plugin for firefox is installed.