Examine source code of iridescent2

{
  "theme": {
    "images": {
      "theme_frame": "header02.jpg"
    },
    "colors": {
      "frame": "#00ff00",
      "tab_background_text": "#ffff00"
    }
  },
  "version": "2.0",
  "name": "iridescent2",
  "manifest_version": 2,
  "description": "if \"iridescent\" contains too much colours ;-)"
}