The 'Yellow' Middle Round Button on the Upper Left Side of the Screen is no longer 'Yellow' and Nothing Happens when I pick it. How do I fix this so it works?

All three buttons used to have a color associated with them. Red (furthest left), Yellow (middle) and Green (right). Red shut down Firefox, Yellow hid Firefox from the screen and Green refreshed or enlarged the screen. Not only is the middle button no longer yellow, but when I pick it nothing happens. This started recently. How do I fix this?

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