When a plugin is click-to-play and is invisible or otherwise can't be clicked on, it seems that many users don't know what to do next. There is an icon that shows up in the urlbar, but I certainly wouldn't have noticed it unless somebody told me about it. I really expected that we would treat CTP like crashed plugins: if the plugin instance(s) can't be activated on the page, we should show a notification bar which would give the user a more obvious way to play plugin content. This is really necessary for audio sites that use Flash (pandora/grooveshark/jango). See bug 809846 which has some specific examples.

If the notification bar is too intrusive "always", I still think we should show it if/when the site tries to script the plugin element.