Opacity add-on for the "Main-Player"?

Unfortunately, "Opacity"-Addon does not work with Main-Player and afaik there is no way to make it work.

I'll try to explain why, so maybe somebody else can build another add-on that can do it:

"Opacity"-Addon does not use real window transparency. It just sets the background-color to transparent, then it sets every containing element to opacity: 0.5 or something. There are A LOT of downsides for this technique: It doesn't work with Mainplayer, it doesn't work on Linux, there are problem on Vista,....

"Opacity"-Addon was only meant as a fast workaround for XP, what Songbird really needs is an "real" Transparency add-on that does it this way:

Use C++ Code to trigger the operating systems Window-Transparency function. This is different on every OS, so someone has to implement such a function for at least XP, Vista, GNOME, KDE, MAC and make the add-on to recognize the OS.
Such an Add-on would solve all the issues and probably could be used on every Songbird-Window (Mainplayer, MiniPlayer, PurePlayer,...)

Sadly I don't have the knowledge to do this. It probably needs this:
* Knowledge on C++ to implement the window transparency method on a Operating-System level
* Knowledge in XPCOM to connect the C++ Code with the Add-on
* Basic Knowledge about Songbird-Addon developing.

I would be very happy, if someone could look into this :-)