ahhh... when i try to Cast from my desktop to my Roku, i see the Roku as a destination, but only "Available for specific video sites". i think it must be that the _Roku_ is restricted as a Cast[ing] destination. my Chromecast HD is in a drawer so i can't test it right now.

so using a real Chromecast, it still is possible to Cast any tab at all?

damn, i should get that Chromecast back out!

thank you for the correction!