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The image stored in the img field is disposed on refresh, but not disposed when the panel is disposed. As a result, an image leaks every time the VivaldiPanel is closed. One fix is to add a disposeListener on the canvas that properly disposes the image.
The following, added in the VivaldiPanel constructor, seems to work for me.

canvas.addDisposeListener(new DisposeListener() {
public void widgetDisposed(DisposeEvent e) {
if (img != null && !img.isDisposed()) {
img.dispose();
}
}

});