Windows 7 - Aero features suddenly disabled

I recently installed Windows 7 and have been using the "Windows 7" Aero theme without any problems. Today, using Firefox, I browsed to a site with a live Real video stream. I got a notification from the Desktop Window Manager (Control Panel\All Control Panel Items\Notification Area Icons) that said something like "Firefox has temporarily changed the color scheme." After this, I noticed that the Aero features were disabled: no transparent borders on windows, no thumbnails when hovering over the taskbar, etc.. FYI I am using RealMedia Firefox plugin.

The only way I could restore the Aero features was to exit from Firefox. Is there more convenient method?

Also, shouldn't Windows warn me that a program is about to change the system in this way, and allow me to decide whether I want to allow it?

Aero does this when a program is not compatible with the aero interface.

Use a different Media Plug in

I get the same problem, i have a fast i7 system but a turd graphics card, windows will sometimes switch off aero to give full gfx resources to running apps to display better