I've just installed TinyMCE Advanced on a site that doesn't use Atahualpa. I wanted it mainly for embedding video, but when I use it, Firefox gives a message that it's missing a plugin and I couldn't find a way I trusted to install it. It works in IE. And I wanted to know if you can embed MP4s with it. (The message was for embedding a WMV.) Does anyone have a clue?

You should go ask the author of the plugin