The screen capture shows what - in context - is a pretty cool effect. When the FF window disappears and at the same time the visual bell causes the Terminal wi

The screen capture shows what - in context - is a pretty cool effect. When the FF window disappears and at the same time the visual bell causes the Terminal window to flash white, the Emacs window behind it bleeds through and quickly fades out. It's like a moment of rage causing brief hyper-awareness. (Alas, that's an artifact of semi-transparent Terminal / OS X windows, which in normal usage is quite annoying...)