Examine source code of Reinbow

{
  "theme": {
    "images": {
      "theme_frame": "rainbow.jpg"
    },
    "colors": {
      "frame": "#6ea7c2",
      "tab_background_text": "#d49b9b"
    }
  },
  "version": "2.0",
  "name": "Reinbow",
  "manifest_version": 2
}