Examine source code of Simple Designs 2

{
  "theme": {
    "images": {
      "theme_frame": "Symbol3-Header.jpg"
    },
    "colors": {
      "frame": "#242424",
      "tab_background_text": "#fca702"
    }
  },
  "version": "2.0",
  "name": "Simple Designs 2",
  "manifest_version": 2,
  "description": "Simple elegant design. Add some aesthetic quality to your browser without clutter.\nDesigned to work with tabs on top."
}