Examine source code of Subtle Interference 3

{
  "theme": {
    "images": {
      "theme_frame": "sub3hd.jpg"
    },
    "colors": {
      "frame": "#cccccc",
      "tab_background_text": "#cccccc"
    }
  },
  "version": "2.0",
  "name": "Subtle Interference 3",
  "manifest_version": 2,
  "description": "Subtle... Int. [XP] - Note: This goes well with the Windows Classic style \"Storm (VGA)\" colour scheme. "
}