Color of toolbar

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Hello everybody,

I set the background-color of a Firefox toolbar to red, OK it appears  
red, but only on the part where the is no control on it.

The buttons are displayed as "icons", so they are images (xul:image)

The background-color of an image would have no sense, so I tried the  
border, but it seems it has no effect, I imagine this is HTML 5.

Any other way to put some red somewhere around the image buttons ?

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