gistfile1.txt

var { ToggleButton } = require("sdk/ui/button/toggle");

var button = ToggleButton({
    id: "my-button",
    label: "default",
    icon: {
      "16": "./firefox-16.png",
      "32": "./firefox-32.png"
    },
    onClick: updateLabelForThisWindow
  });

function updateLabelForThisWindow(state) {
  button.state("window", {
    label: "window-specific label"
  });
}